Six years on a 486, two years on a PII (with a Riva TNT2 upgrade a year later), and finally a Barton rig about three years ago. My current Barton 3200+ is, I believe, in its second year. I plan to ride this one for quite some time.
I'm a performance whore, so I usually upgrade often. I don't usually run out and buy top notch things, but just what's good. I don't think I could be satisfied with a 3 year old computer, personally. I think every 2 years would be more reasonable.
Heh, that depends on who you buy the case from. The guy I purchased the TJ07 from included two radiators and two pumps with it, but in general, you just get the case unless you order from a specialty shop (and thus pay extra for components and assembly).Does the TJ07 come with the water cooling unit or did you add that in yourself and then take the pictures?