That CPU is 1155. More upgradeable than AMD unless you get an AM3+ motherboard (which at low end, i dont think they are).
Most dedicated rigs dont even use a case or will use a custom made one.
Board works fine, if you really are worried about power get a riser cable and mod it (I didnt mod my 4 and it works fine). Not that 16x gives out any more power than 1x: http://pinouts.ru/Slots/pci_express_pinout.shtml
, extra power is drawn from the 6 and 8 pin connectors. These slots are PCI-E compliant.
I dont think any motherboard can space the cards properly with 4 cards.
Maybe because for the price of just the processor/MB you posted I can get an AMD sempron, a full size ATX MB, 2GB ram AND a PSU?
Which one? I couldnt find one readily available and that could fit 4 cards, riser or not.