Whether you get a full suit or a sleeveless depends a lot on how you deal with cooler water and how comfortable you are in the full suit. I got a sleeveless because I get claustrophobic in the full suit. If you can, try some suits on to see how you feel.

I have a Promotion women's suit. I went with them first because they were about $100 less than any other brand. I'd read reviews on a bunch of sites and they were all positive. I was even happier when I called Promotion. The customer service was excellent. They really work with you to figure out what the best size would be. The downside to them is that you have to order by phone or online, so you can't try the suit on. (But they're very good about exchanges.)