i think its difficult to compare hardware thats "future proof". In the end, all hardware will be outdated but you can work out how "future proof" something is by these few factors:
When it was released - Socket 939 is fairly recent so it will last a fairly long time.
If It was popular - 939 will last longer than 754 mainly because of lack of popularity.
Core 2 Duo E6400, DFI Infinity 975X/G, 2x 512mb DDR2 667mhz, Albatron 7900gt, WD 200gb SATA, Samsung DVD-RW, Silverstone ST-50EF 500w PSU.