Ubuntu 32bit or Ubuntu 64bit

[xpygmy]

I am about to download and want to know which one should I get, I will be using my computer for gaming, surfing and the occasional homework.
Which one should I get, on the website it recommends the 32 bit OS, but since my system is high spec should I go for the 64 bit or is the 64 bit slower, buggier or what?

System:
i5 3570k
8GB ram
msi 7950

EDIT: It is Ubuntu 12.10

 

[xpygmy]

64bit

thanks, any reason for this? Does it improve performance or is it just better?