Mainboard and CPU suggestion

Guys,

I have a working q6600 and an older amd machine right now. I am planning to build a new i7 system, while keeping q6600 for rendering purposes. Here is the question:
I have a 500w Tagan power supply, and gt8800 video card to be used on the i7. But I cant decide on the mainboard and cpu.
My budget covers only these components, so please make suggestions according to the budget:

INTEL Core i7 950, 3.06GHz, LGA1366

or

INTEL Core i7 930, 2.80GHz, LGA1366

ASUS P6X58D Premium, X58, LGA1366, DDR3-2000

OCZ Gold Edition (OCZ3G2000LV6GK), 6 GB Triple Kit (3x2GB) DDR3-2000MHz, Low Voltage CL8

My main concern is about the motherboard. Stability is my first priority. I only overclock machines which are replaced by other ones. (so the time is nearly come to overclock q6600) This means, I will not overclock the i7 for about 2 years at least. After that I will try to overclock it as much as I can. But even i cant, its not that important.

I am considering this board because I think that if a board can handle overclocking well, it will be stable and produce less heat without overclocking.

The second concern is about the SLI opportunities of this board. There is a chance in about 1 year I can replace the powersupply and the graphic card, but it is unlikely i will go for the SLI.

Do you think this board is too much for my needs? Should I go for a less expensive option and make the rams 4x4 or 4x4x4? I also considered about the option of Gigabyte GA-X58A-UD3R, but since I read somewhere that when it comes to stability, asus is the better option, I give up on that thought.

I will be glad if you pros make comments and suggestions about my assumptions and needs.

Thanks