You can keep the same RAM, here's what I'd buy for 450 ;
GPU ; http://www.overclockers.co.uk/showproduct.php?prodid=GX-305-SP
CPU ; http://www.overclockers.co.uk/showproduct.php?prodid=CP-418-IN
Board ; http://www.overclockers.co.uk/showproduct.php?prodid=BG-252-GI
Cooler ; http://www.overclockers.co.uk/showproduct.php?prodid=HS-098-TR
Overclocking is very easy, people will take you through it.
Sell the FX8120 and current board, get yourself a nice IPS screen at 1920x1080.
Pricing on Haswell stuff is unknown, but the first parts to launch will be the mainstream, I'd hope they would mirror SB/IB launch prices, which would mean you could probably get away with 300-350 for a board and CPU.
ok thats some food for thought
