I had a lower body lift surgery April 28 for loose skin. That's like a tummy tuck but it goes around the back also (ie lifts your butt and sides). I also had a breast augmentation because my boobs were very saggy. I will be going in to have some corrections done to it most likely, because my belly is still not what I want. But it is soo much improved from before and the experience has been totally worth it so far.
The "batwings" thing you speak of, yeah--I have it. I want more surgery, and I will get it.
But even if I didn't get it... I don't regret for one second losing the weight!!!! You will be so much better off *no matter what* you decide about surgery.
When you're ready for all of the information we can give you, check out the "body issues after weight loss" forums. There I posted in detail about my recent surgery, and there is a very informative sticky post all about skin.