I had one done about 13 years ago and I'm still happy as can be that I did it. (My significant other isn't so happy about it, though. :) But I did it for me as it's my body and comfort, not his.) I was 26, and before I had kids, so I think I gained a little of it back after 2 boys. In any case, I had a pound taken off each side, and afterward, I looked like I'd lost 10-20 pounds! I could buy shirts and pants in the same store, and find a one-piece swimsuit that actually fit.
Advice for you is to find a Dr in your HMO that can give you a referral to a really good cosmetic surgeon...you don't want a general surgeon...or someone who just feels you up in the exam. A good Dr will show you the pics of before and after...good and bad. He/she will measure where your breasts are compared to your elbows and feel the weight. And, after the surgery, will recommend bras to help reshape your new breasts.
(I used Meleleuca oil on the incisions and they healed really quickly...my Dr was impressed.) Today, the scars are barely visible.
I was able to breastfeed some though I had to supplement with formula (and the Dr had told me I might not be able to at all). All in all, it was the best $12,000 (of my health insurance's $) I ever spent! :)
Good luck and if you have any questions, feel free to contact me directly...