Hitachi 19" (4 years old, still going)
MS Natural Elite Keyboard (3 years old, still love it)
Atlec Lansing 48 (3 years old, still shakes the floor)
MS Sidewinder (3 years old, free after rebate, still using it)
Broadband
Every other purchase that I've made or will make will be obsolete and replaced ~9-15 months, so they can't really be considered the best.