I could recommend
GENGHIS KHAN MONGOLIAN GRILL
900 Don Mills Road (Lawrence & Don Mills
It's nice new buffet place featuring a gigantic grill. The dinner price is $19.99 for adult over the weekdays.
Radisson in North York... I'm guessing it's the one near the Sheppard and Victoria Park.
In that case, a good Japanese place I can recommend is Aoyama, one block north of Sheppard on Victoria Park. It's a tiny place with a pretty small menu, but the food is well-prepared and service is great :)
I also second oohlala's recommendation for Nakwon. Great korean food.
if you're along the subway line, Yonge/Finch area has some amazing Korean cuisine. My favourite is Nakwon (SW corner of Yonge/Finch). Just discovered Lim Ga Ne (south of the Esso gas station). If you go further south (west side of yonge), you can find "The Party Restaurant" that sells Kimbab (korean fuki), get the spicy tuna if u're there.
There are some pretty good persian restaurants in the same area. enjoy :)