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Stay a year behind the current tech. Buy very good quality, but slightly outdated components, and you will have an easier life.
It takes about a year for decent drivers, patches, workarounds etc to appear for hardware, and for the hardware to have been on the market long enough to gather public opinion about whether it is reliable or intrinsicly flawed.
If you want it for a specific purpose ie, high end audio, then often problems with hardware don't become widely known for a long time after it's release. (Graphics cards and VIA chipsets being the worst offenders).
I want stability and speed out of my computers, and would rather other people did the beta testing for me.