HMV are doing a crystal xbox for £99 and one game for £10, not a budget
This is Trafford Centre, Manchester
It's hard to recommend games when we don't know your genre! What sort of games have you played before? Guns!, fighting, strategy, racing, role playing etc...
I like most things except fighting and role playing (rpg).... I like and recommend Halo, Halo2 (out next month, best get your skates on and complete the first one!...well worth it...), Ghost Recon, Rainbow Six, Fifa 2005, Colin McCrae 2005.....on budget you can pick up Rallisport 1 or Colin McCrae 2004

Rallisport 2 is also good but buy Colin McCrae 2005...
Project Gotham 2 is a top buy, not the first one. Crimson Skies, Splinter Cell, Counterstrike

... and of course Return to Castle Wolfenstein...
...and you won't beat Grand Theft Auto to waste the weekends away