Imogen had some ideas for different body types on her blog
http://www.insideoutstyleblog......-type.html
To be honest, when I have to buy a bathing suit, I go into a specialty shop and resign myself to trying on everything in the shop. If the staff is any good, they should be able to help cull through their stock and bring you suits that work with your particular body shape.
I've also had good luck with Land's End. I was skeptical about buying a suit online, but, surprisingly both suits that I ordered fit perfectly and were very flattering. And the price was good enough that I kept both.
I'll bump this post, so maybe some of the other ladies may chime in.