If you are still uncertain about what you want to do, you should probably do a medicine prelim year, or just bite the bullet and decide on something to do (IM, fp, nuclear medicine, pathology, etc.). Agree w/above comment.
Prelim surgery years are often a dead end, particularly if you are a foreign grad, and you'll be so tired and busy you won't have any time to interview for PGY2 spots. You probably won't if you do IM prelim either, but you'll have a better chance. IM prelim also "counts" for more other specialties as a prelim year - surgery you can basically only use for surgical subspecialties (that you'll probably not get as a foreign grad) radiology or anesthesia (also hard to get for IMG's). IM you can use for neurology, internal med, anesthesia, possibly PM and R, 3 months toward psych intern year, probably some credits toward ER or OB residency, and on and on.
I personally feel like there should be TY spots available for people still deciding on a specialty, but our system isn't designed like that. The DO's used to do rotating internships, which is probably a great idea. The system is set up to produce doctors, not necessarily educate us (trainees) to the max or help us pick the specialty that will make US most happy. It's kind of unfortunate but true.