I have several computers. I have an archaic Windows 95 machine from IBM (13 years old),
I have an old, shitty Windows XP-based laptop, which I use for IE 6 testing and for writing viruses and Windows exploits.
I have a crappy Sony Vaio, with a measly 500gb HD, and only 3 gb of RAM. With XP Media Center, also dual-booting with Ubuntu.
My best computers, however, are:
A Power Mac G4, which I got from my school for free when they switched to Dells.
An iMac (new) with 4gb of RAM and a 1tb HD, as my home computer. When I travel or go anywhere, such as the bathroom, I use my MacBook Pro 15-inch. I'm still saving up to buy a nice, high-end Mac Pro with 32 gb of RAM and 4tb of HD.