Sounds like you would be right between a medium and a large and you could even pull off a large short... here is a size chart:
http://www.bravesurf.com/Knowledge/O...1/Default.aspx
I recently got a 4/3mm and a wetsuit top, I'm from Minnesota and I don't really feel the need for a 3/2mm although they are nice for when the water is freezing but the air is warm. I've heard from some people that if you get any thicker than a 4/3, it becomes a lot more difficult to move around. I wear my wetsuit when the water or air is 45-65 degrees. I will wear my wetsuit top in 65-75 degrees.