I can second the ProMotion recommendation.max wrote:do you have any brand recommendations?
I was shopping for my first suit last summer, and checked out ProMotion on the recommendation of a friend. I've very happy with the purchase. First tried it on for a dip in Tahoe, and the 3mm kept me toasty and dry in what must have been about 50F water! When I finally was able to get lessons scheduled later in the summer I found it was comfortable in Rio Vista in July and August (as a beginner I was spending a lot of time in the water).
ProMotion seems to offer great value, a lifetime warranty on seams, and great customer service. I had a small blowout on one of the seams and they had the suit back to me within a week. All it cost me was ground shipping to Oregon.
The ProMotion website is www.wetsuit.com