I don't want to pull rank, but
THIS is the Chinese restaurant you want to go to.
IMHO there are 2 types of Chinese restaurants in Chinatown: the tourist traps and the so-authentic-I'm-scared-of-what's-on-my-plate type. But maybe that's your thing.
San Tung (linked above) is in another mini-China town over near my neighborhood. To give you an idea...there are several others nearby, but this is the only one which has a line of (mostly) Chinese out the door.
If you get there early enough, you're fine...but come 7-7:30, it's a 1 hour wait.
PM me if you want...I'd be up for a dinner with my wife, too, at this place
edit: when you going to be here? There are great places in Little Italy, too!