Hello,
I would like to build mobile workstation, that will fit into backpack.
I think i5-2500 would be enough, so I will OC it to 4,1Ghz
and I will have one GPU, now its Ati V7700 Firegl, in a future it will be Ati FirePro W5000.
I think I will own max 2 hdd in a raid, maybe 2 ssd and 1 hdd for storage (but this one can be external.)
maybe max 3-4 PCI cards, but I don't think it will be more than 2.

So probably it will be microATX form factor. (or ATX)
Fanless ATX PSU, and if I will find some good and cheap fanless cpu cooler.
but what is needed: normal size GPU in case.
maybe on some pci riser to make it more slim?

Please help,
Best regards.