And my shopping list gets bigger!
I'm an Nvidia fan myself, so I'll probably go with something like the 8800gts. But I'd probably be willing to throw more money into the motherboard than any other part, that way I can upgrade later this year if it's possible.
Yeah, other than the Radeon HD 5670, the Geforce 8800 GTS is one of the best best deals performance-wise on Newegg. The motherboard that 87dtna listed seems pretty good. What would really top it off is SLI support, but sadly the only cheap SLI motherboard on Newegg only supports ddr2 memory
Also, I have Kingston RAM and it works great, so I would say that the RAM is good too.
EDIT: I just found out on Newegg: the Xeon you're getting only has an FSB of 1066MHz, so the RAM you're getting won't be supported at full speed. You can probably save some money buy getting 1066MHz memory.
DOUBLE EDIT: Forgot you were overclocking. Nevermind. After OCing your FSB will take advantage of the full RAM speed.
TRIPLE EDIT: You may also want to get 1600MHz memory for overclocking. 87dtna said that the RAM he listed could hit 1600 easily, but the RAM listed below has a higher default speed to allow for higher stable clocks, and it has a heat spreader.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104136