There are some gorgeous machines in this thread!
I have to echo the concerns about cheating though. What's to stop someone from downloading a bunch of PC pictures from all over the web, creating a ton of brand new dummy accounts, and then posting them all separately to inflate their chances of winning?
It seems like requiring an account join date prior to the posting of the contest would be prudent in order to prevent such fraud / inflation spam.
Anyway, here's my old workhorse via horrible cellphone camera: