Hate to burst your bubble NOS, but rice in and of itself isn't really that healthy. In fact, I can think of a lot of really unhealthy rice (Chipotle's comes to mind). It all depends on the way it's prepared and what's in the dish. Brown rice is way healthier than white rice (it also has a taste--yum). In fact, anything that's "white" (or "refined") has usually been processed to death, draining it of any nutritional value. (Refined/bleached/enriched) White flour, (refined) white sugar, white rice, etc.
Rice, unless you're talking brown, is all carb and very little fiber. Brown has more fiber, but it's still carb-y.
As far as ethnic foods go, Japanese is usually the healthiest (again, avoid the fried stuff like tempura) because of its reliance on protein and seafood (miso soup, seaweed, fish, edamame, etc)
Authentic Chinese can be healthy, but none of that actually exists anywhere in America outside the most cosmopolitan cities. Avoid Chinese--it's deep fried and greasy.
Mexican is another cuisine that CAN be healthy...but in the US it generally isn't.
Thai isn't too bad, but it depends on what you get and how it's prepared. I'd say it's a little healthier than Chinese, but nowhere near as healthy as Japanese.
Basically, though, you can make whatever cuisine you want yourself and make it healthy. Buy a wok and make chinese stir fry with minimal oil, use a lot of fish and low-fat beef on the grill, use shrimp, crab, lobster and scallops and whole grain pasta for italian (stay away from creamy sauces), use whole grain tortillas and grill some fish tacos, etc.
Dude, just get a cookbook and start playing around. You'll soon get a sense of what works with what and what tastes better/is healthier/unhealthier. Joy of Cooking is a good one.
I also recommend doing some reading on the internet about appropriate portion sizes and how many calories per meal you should have.