Hard question to answer. If I'm hungry, and I'm eating *one* of my favorites, it's often my very favorite at the moment. Here's what I love, though:
Mexican
Thai (Pad Thai with extra bean sprouts, that hot and sour chili sauce, and peanut sauce...mmm..)
Persian (Chelo Barg/Koubideh)/Mediterranean (includes several)
Japanese (SHOGUN!!!! (or Kobe's, or Benihana's...all very much the same)
Italian
Indian
Korean
Oh yeah, and BBQ!!!! (Ribs, pulled pork, brisket, Tri-Tip...etc...!!)
There a lot more that's great, but these are the big ones that come right to mind.