What i have heard is x360 slim(mine) with kinect edition will not support mod chip.My relative said one of his friend a gamer tried but spoiled his xbox 360.
I heard earlier ones can be added with mod chip.This same relative bought me 3 new xbox 360 games worth 10 k!!
I have it and am playing it.
Other title I have are :
NFS Shift - killer graphics man.
Assassins Creed 2
Soldier of Fortune - best 1st person shooter
Prince of Persia - got it free with my XBOX
Burnout Paradise - Super amazing controls.
Call of Duty: Black Ops
Well i would say excellent.With hdmi cable it reached to a new level.I have ps2,psp as well.The joystick of ps2 is very light,i used to develop pain.The controller of xbox 360 may look weird but is very comfortable,excellent build quality.
Mine is the new updated version 250 gb,beautiful to look at.
Just recently I gifted myself Call of Duty MW2, Halo CE Anniversary & GTA 4... Fabolous games I must say!
Planning to buy Mass Effect 1 &2 ,Halo 2,Halo 3 & Halo Reach, FIFA 12 in the future.
Also anticipating the launch of GTA 5! :)