i also choose against recon... and i'm just going flat. i do not use prosthetics or anything. so, a tank top style swimsuit is the way for me to go... or a speedo style swimsuit...
but, if you wanna get something that will allow you to have breast forms or something similar, i have heard good things about lands end mastectomy swim suits...there's also this website called swimsuits for all. anyway, a google search on mastectomy swimsuits yields a TON of results... since a swimsuit is so much more than the bust... well... for me, i'm quite self conscious about my butt... so that's important too, right!
the last thing i'll suggest... and this is also what i might do... is wear a surf shirt. i'm kind of leaning this way because i also have a bunch of moles and want to be a bit more careful about sun exposure on hard to reach with sunscreen places....
hope that helps!
best wishes,
lee