Hello. I'm building a new rig so i need some help. I decided that i will take the intel i5 2500k and clock it to 4GHz with cooler master tx3 cpu cooler. So thats the first requirement. Second, i will use my old 3870 before i get $ for a decent upgrade. So it will need to be compatible with pci 2.0 and 3.0 (is this possible? Can one slot be suitable for both 2.0 and 3.0 cards?). Third, i want usb 3.0, sata 3 and ddr3 that can handle atleast 1600mhz. If i remember something else i will post but for now these are the requirements. The cheaper the better! Thank you.