Best MOBO available for Q9550>?

Heya All, Looking into building myself a Ultimate Extreme Rig.

First of all, I'm going to have a Q9550 Processor. Going to Overclock it.

Maybe a GTX 260, but if I have money left over, I will definitely buy the GTX 280. In the near future, probably 3-5 months, I will buy another GPU, so which means I need a MOBO that supports SLI.

I'm going to start with 4gb ddr2 Kingston, but if I have money, will move up to a 4gb ddr2 G-skill. Will add another 4gb in Near future.

So my question is, I need a MOBO that supports the above 3, SLI Ready and is capable of OverClocking and is one of the best. Will be spending under $400 for the MOBO. My budget is $2500.

Thanks

You call that an "Ultimate Extreme Rig"?

Are you aware that the entire platform (s775) will be non upgradeable? Yes, you will never be able to upgrade it, its a throwaway system.

If your going to build new, go for an i7 or AM3 Phenom 2. DDR3 is the new poo.

You should never have to spend more than $200 for a mobo unless you just like spending money. I mean you want to spend $400 on a mobo (a non upgradable one at that)

Dont get a GTX280, they have been replaced by the GTX285 and you wont be able to find a 280 later.

Dont cheap out on ram, get something like Corsair, OCZ, Patriot or G-skill.