I wanted to be different....lol
No seriously though I'd just built an AMD Phenom system for a customer on request and was impressed with how it ran etc - I've always had AMD systems in the past and couldnt really fault them - so I stuck with it. Also I'd read a few reviews on how the newer Phenom processors were alot better than the older ones so just thought well I'll give it a try!!
Ideally though had I had the spare cash I admit I'd of gone for a processor in the Intel Core 2 Extreme Quad Core range.