cpu: intel core i5 2400 or core i5 2500k
motherboard: asus z68 v pro gen3
gigabyte z68x ud3h b3
asrock extreme 4/extreme 4 gen3/extreme3 gen3
look up the review of your chosen motherboard.
is your case sff or mini tower? the biggest problem (after the sff case) would be the (oem?) psu if you want to run discreet gfx cards.