Although this thread is a year and a half old, I am going to resurrect it to add my two cents for the benefit of anyone else who may happen upon it.
There is a lot of good advice on this thread. Seeing that you are unable to try a suit on for fit, you will want to ensure that both the online store you buy your equipment from has a satisfaction guarantee, or at least the manufacturer does.
When shopping online, you will also want to ensure that the online shop is an authorized dealer of the manufacturer. There are online stores that sell items that the manufacturer will not honor the warranty if you buy them from them.
Talking about warranty, when I buy something I want to get the best bang for the buck as to say. I want a product good in quality that also has a good quality warranty, and all for a good price.
I myself personally prefer Bare; this manufacturer produces good quality items for a good price and offers a 2 year warranty. Waterproof also is good quality and also has a 2 year warranty, and Aqualung has good quality and offers a 1 year warranty.