thhe lo stuff is awesome i highly suggest it
also i like the bomberman game that is out on live

What games do you own? Have you looked at the Arcade selection?

u can always spend them on me... and if ur dead set against that theres always DLC for GTAIV and Fallout3

I would suggest getting Portal: Still Alive or Castle Crashers.

So much things to get on Xbox Live, I don't know where to begin... let's go with these obvious items:

Braid (MUST HAVE),
Rez Hd,

Blow (Community Games)

Rock Band songs

and so on...

portal would be a good choice but GTA San andreas is a good xbox origional if ur into those games at all. Castle crashers is good too it depends on what you like but id say Portal: Still Alive

Other arcade games that are good are:
Braid
UNO
Bomberman Live
Bionic Commando Rearmed
Banjo Kazooie

fist get the lost oddyssey u obviously want it and it is worth the purchase and then get what ever looks good