depending on what you have already then one of these might be the ticket:
gelid tranquillo (~£25 from here)
wired xbox controller - works great for some of the driving games on the PC if you cant afford a wheel. also allows use of the xbox mic in games (~£15 elsewhere for the controller)
other than that, the only obvious answer is PC games, such as:
crysis maximum edition (includes crysis, crysis warhead and crysis wars. may be cheaper to get separately on steam)
Just cause 2
dirt 3 (xbox controller works great with this apparently)
etc, etc