Help Building Custom UMPC?

[Macgyver1]

I am considering building my own UMPC using VIA motherboards and other hardware. I understand it will be expensive, but I am tired of waiting for the UMPC I want to come out. Can someone recommend which VIA Motherboard should be considered for Low power and small form factor. I see the Embeded series and Ultra mobility too. If you were building your own, what MB would you use and why?

Thanks

[Thelgord]

I am currently loking at the Pico-ITX main for size reasons.

[digitaltomo]

Thelgord, or anyone... i have bought a pico-itx board with 1gb RAM and i want to have a screen around 5" and a compatible power supply that will power unit and screen together. can you please help. i have absolutely no idea about this so as much help as possible would be greatly appreciated please!