A server project...

Hey folks...

God evening.

Hey I have a little project on.
I am building a server for my 15" powerbook (hope it comes soon) and for my M$ XboX.
I am thinking on a Micro ATX mainboard or an flex atx that I am going to put in a homemade case, It will be thin like a smal rack pc.. I am going for an pc cause i want to run slackware linux on it and I have low cash flow thease days.
But its only for two computers so i dont need so much performance.
And i am not gong to use any pci slots cause i hope on a card with integrated, vga, sound, lan, ect..
But any way i need a small mb and a smal power supplay.
Or mybe some one have info to build a powersupply..
The only thing i need is a mainboard that support DDR ram.
Cause I 768MB DDR just waything to be used.

Can some one help me recomend a mb and a power?

Thanks for the help.
Best regrets ApproX