I bought a socket 754 config even when it was on the verge of dying, in june this year. The advantage ? The cost of the CPU+ mobo combined was less than the cost of the cpu itself on the s939 at that time.
Plus i am running my cpu o/ced without crashing, running rock stable @ 2.43 ghz, and it's on par with a Socket 939 3500+
I am quite positive this cpu/mobo config will last me for more than a year and a half with high performance in most games.
S754 wont be over officially till those cheap and fast semprons are released, in performance sense.