I was thinking of trying out one of the Venice 754's, but then I went crazy, sold everything, and went 939/Dual-core
Honestly, I wouldn't even bother upgrading your 3000+, unless you just want something new to play with. In that case, I'd get the Venice (with the 90nm process and the SSE3 optimizations, etc.) and hope for around 2.4ghz (at least).