I would recommend asking in the Weight Loss Surgery Forum.
http://www.3fatchicks.com/forum/forumdisplay.php?f=78
I know Jillybean is looking at getting the duodenal switch.
Honestly, I'd be concerned slightly if you are looking for this surgery in order to eat 'everything that you want', lose weight and maintain that weight. From what I know of any weight loss surgery, it'll give you a boost, especially in the beginning but you will still need to exercise and control your food in order to keep losing and maintain that weight loss.
Realistically, with any 'diet' you can eat 'whatever you want' basically as long as you eat small portions of it.