I'm probably gonna get flamed for this, but personally I'd go PII just to be rid of the ty ICH10 controller. If PII can offer similar performance to yorkfield at a lower power consumption, that coupled with a better mobo chipset imo then it would be a viable alternative. Especially seeing that i wont have to swap out my ram. I primarily use my machine as a development rig and right now i barely strain my wolfdale.

This is all dependent on pricing tho, a lot of people might find it cheaper to move to yorkfield if they already have intel systems. CPU wise I'm running a wolfdale because yorkfield was prohibitively expensive when i bought my CPU. then again by feb the prices of the yorkfield chips may have dropped.