I finally bought a drysuit last year. Like the suggestion to go to a shop with rental gear, that is what I did. I tried a few shops but they never really made me feel like I trusted them enough to hand over $2000+ for a suit. One shop said they'd rent me a drysuit but didn't really make me feel like they'd take care of me. It felt more like they'd rent me a suit so I could take a course in the pool with them.
Last year I found a shop with rental gear and told the owner the truth... I didn't want to pay $2000+ for a drysuit only to find out I didn't like it. So they let me try on a drysuit right there in the shop. They pulled out a drysuit and undergarments from rental and helped me try it on. I was a little worried about not knowing how to adjust the neck and wrists, how to burp the suit, taking care of the seals/zip, etc.. The owner was patient and walked me through everything.
I didn't know how things should feel and what was right but the owner told me what was good and what wasn't. We tried on a few things to see what fit best. A few weeks later I bought a drysuit, dry gloves, hood, undergarments, etc. I have quite a few dives on the thing and it is great. Absolutely no regrets.
Try a few shops and hopefully you'll find one like I did.
I will say one thing however, I found very few shops which sold drysuits when I lived in Texas. I found one which rented drysuits. When I moved back to Canada (Great Lakes area) I found a lot more places which sold and rented drysuits. I noticed a few posts here talk about northern shops which rent drysuits. Maybe it is time for a trip to Chicago? Or you might find luck in Florida.
One tip, back zip drysuits are easier to get in and out of. Front zip suits are either a little harder to get out of (but fit great) or they are a little too loose.