Best LAN Games for 360/PS3

So me and some buddies are going to be doing an Xbox360* LAN party. What are some good games that will do split screen? We have 3 TVs, 3 Xboxes and 6 people. We usually do Halo and Gears 2. Does Black Ops do split screen over system link?

Other games I was thinking are Halo Wars, RUSE, Hawx 1/2, Hot Pursuit, OrangeBox, Blitz 2, and Castle Crashers.

Any other recommendations?

Any good places to get these games cheap?

I was planning on renting and a few of us have Gamefly, so price isnt a huge issue.

*We also have 2 PS3s, but might be able to get a third. We have a lot less PS3 games, but any recommendations on them are welcome too.