i'd say the 2200/7200, since u already have the holes for the posts.
but first check your neck angle, if you have a typical Les-Paul neck angle, then go with the X200. if your geetar is flat-top and have almost no neck angle (sorta Tele or Strato), then go with the X300.If you go with the X300, u'll have to cover those nasty holes where tune-o-matics used to be. Go with the X200. (is only my advice)
I'm still hesitating between a 7200 or a 7300 kahler, on the website it says that it's only 50% chance that my existing studs are at the good position to install the 7200. If not I'll have to make new holes and relocate the studs to install the trem... If it's the case then I'd rather go for the 7300 directly...
My body was pre-drilled by warmoth (scale 25 1/2, flat top and t-o-m) and here are the measurements of the bridge: (maybe wammi wil be able to tell me if it's going to work with the 7200?)
thanks