I'll take:
7800
Centipede (1988, Hong Kong)
Ms. Pac-Man (1987, Hong Kong)
Galaga (1987, Hong Kong)
One on One (1987, Hong Kong)
Atari Flashback2
Dreamcast
Tokyo Xtreme Racer - $2
I would also suggest looking for one of these:
eBay Auction -- Item Number: 200701612551
I bought one from this guy and haven't regretted it one bit. This is the model i got the 2 gb cf card. Needless to say i will never have to worry about running out of room for disks.
There are basically disk images out there with all the cartridges roms on them to play as well so you would only need an Extended Basic cartridge and Editor / Assembler cartridge. Although you might be able to use disk images for them as well but I didn't try and just bought those two cartridges.
Have fun with a great little machine.
A couple of games i would recommend if you get this device is the remake of Pitfall! and one called Never-Lander. Pitfall! speaks for itself and Never-Lander is a very very addicting game. Think a never ending version of Lunar Lander.