When it comes to my hardware buying habits, i try to get the cheapest stuff that has the best performance to cost ratio.
Aslong as it gets the job done for ATLEAST 3-4 years, I'm happy. But computer parts are designed to last a long time, and with prices of hardware falling fast, I don't really see a problem in the future with higher prices as newer technologies will exist and prices will continue to plummet. My old computers PSU was $20 and it last me a solid 5 years with the occasional reoiling of the PSU Fan.
The computer in my sig is going to last me another 5 years, atleast.