AMD AthlonT II X2 250 Black Edition Dual-Core CPU Xion Vulcan case 4 GB DDR3 ram 500 GB harddrive GTS 250 1GB geforce videocard MOTHERBOARD:Asus M4A78LT-M LE AM3, 2xDIMM, DDR3 500W supply Is everything their compatible? 500 pound buget, just meets it. Tips, dos and donts.