Mike I have a DUI CNSE and am quite happy with it.
http://www.dui-online.com/dry_cnse.html

It was for me.  FWIW, one of the instructors at the LDS had a repair
issue with his drysuit and couldn't get it repaired in time for a class
this past weekend.  He and I are about the same size so I offered to let
him use my drysuit.  When he gave it back to me he had nothing but
positive things to say about it.  His regular suit is a Viking.

How cold do the waters get?  Mine is 1.5mil compressed neoprene.  I
generally wear a sweat shirt and blue jeans and am comfortable in 50-60
deg water.

Can't help you there.  My LDS gave me a preferred customer price on mine
which included the canvas carrying bag, rock boots, wrist seal
lubricant, zipper wax, and a drysuit class.

Andy

WOW! A SCUBA question! Who'd a thunk it?

As for DUI, I dive a TLS-350 and love it. Wore my wetsuit (full 7mil) a
total of 3 times this summer. Decided last Saturday's dives (65 minutes and
54 minutes at 50 degrees) was the last time I'll use it this year. Still
like the smaller weight requirements diving wet but I'm turning into a wimp
once it gets below 50 degrees.

As for which suit to use, the trilam suits are really suitable for any
temperature as you just alter the undergarments you use. My heavy fleece top
and bottoms along with a wicking polypro. set of underwear keeps me
comfortable well into the 40s. I can always add an extra layer.

In SoFla, I'd guess that a light layer of non-cotton would do the trick.
(Cotton holds the moisture and your sweat will chill you.)

Good luck.

As far as I know, yes.

She should ask about the 30/30, which is designed for use between
30deg North and south, hence your area.   It's GoreTeX, breathable,
suitable for warm temps on the surface, in theory.  I can't endorse it
one way or the other, don't know anyone who has any experience with
it, but DUI would certainly recommend it as a possibility, I think.

They're not bad :-)

Firstly, a shell suit is important.  I will bet she dives with very
little lead thus does not want to start skewing her buoyancy.  Any
neoprene will make her feel like a cork bobber.  In warmer cold water,
60-70° F, a 200 gram thermal undergarment will probably do, with a
layer of underarmour if needed.

DUI offers a TLS350 which works well. I've dived this suit for nearly
a decade and like some features such as the front entry - I don't
always have someone handy to give me a zip. That said, the DUI suits
have a good deal of material around the middle due to the telescoping
torso needed to allow one to actually get into the suit.  The extra
fabric adds a little drag that a larger person might not notice, but I
feel it.  And as JOF says, the DUI suits make women look like shorty-
a.s men who look funny.  But I digress.

I have another suit, a prototype kind of thing that never really was
marketed anywhere.  It's snug, I can move freely, and it doesn't have
the extra mid-section material because its back zip.  This suit is
totally no frills and I love it in the water because it's so
streamlined.

She will be most pleased with a shell suit that fits well (go for
custom if you have to; my DUI was made before they had XS suits on the
rack. I've heard pro and con on the zip seals as I've always had only
the original model.  Get the warm neck seal and a thigh pocket, for
sure.

I can't help you there, but whomever sells you the suit should throw
in a drysuit "class" or orientation.  It's a stupid "class" as all you
really need si someone who dives dry regularly and knows enough to use
the suit inflation for warmth, not for buoyancy.

good luck, and do share what she decides.

*
She's very much more than a dive babe, but they don't have a name for
it on this planet yet.
~ Douglas W. Popeye Frederick

Don't know about that. There are a number of
divers around here in DUI, but  DiveRite and
a local mod who do crushed neoprene are also
popular.

Tri-lam suits have pros and cons, IMHO -- Note
that I dive in a DiveRite tri-lam suit.

The positive, others in the thread have mentioned,
it has minimal effect on the buoyancy.

The two negative points  that may need to be
considered are:

in really cold water I find that I have condensation
on the inside of the suit that leaves me damp after
a dive.

Others tell me that crushed neoprene is more resistant
to abrasion. This sort of surprises me since my DR
has Kevlar patches all over it - but I do know that
I've had a few small leaks patched in the 2-3 years
I've used my suit.

YMMV, etc.

<opinion>
You could get away with nearly anything in the conditions
there.
</opinion>

In my opinion, one fo the best undersuits that you can get
is a weezle from this mob: http://www.weezle.co.uk/
I've used two of theirs. One was too warm the other is OK.

In 50 F here I've tried the Weasel Extreme+ which I personally
found to be just too much. I now use the lightest weight
Weasel - the Compact which was fine all through the Winter.
(If it thought I was going to get cold, I'd add some Damart
long underwear underneath. (I suppose that's the best bit
about drysuits generally -- you can add or subtract the
layers of undergarmets to suit conditions. And it's a really
individual thing -- some people feel the cold a lot more or
less than others. get what's right for her.)

The reality here was that I had to do a weekend PADI
course before I could get on a charter boat with a
drysuit. I did it all by the book in the course, and then
promptly moved to a "minimum gas in the drysuit/ control
buoyancy with the BC" approach as soon as I started diving
after the class. There is simply no way to control buoyancy
deep by using the drysuit with 300 bar 2 x 12 liter cylinders --
they're just too damn heavy.

Hope this is useful...

-Don