As my current skill about hardware, I would in you case have picked up an i7, but if I understand your question right, you want either the Phenom or the Q9650. The s775 is reaching the end of their lives, and probably will the Phenom too in not too long time.
Q9650 costs over $300, but got a 12Mb L2 cache. The i7 is using L3 cache http://www.newegg.com/Product/Product.aspx?Item=N82E16819115130
The Phenom is over $100 cheaper, using L3 cache and is probably better for your usage http://www.newegg.com/Product/Product.aspx?Item=N82E16819103674
I might be wrong, listen to the very experts aswell