I'm currectly quadboxing. 3 wow's on my main pc and 1 wow on a 7 year old pc. Now i'd like to go for 5 boxing, but before that i need to upgrade my PC or buy a second one to run 2 or 3 slaves on.

My main pc's specs:
 GigaByte GA-P35-DS3R, P35 (ATX, Sound, LAN, SATA II, RAID)
Intel Core 2 Duo E6850 (S775, 2x3,00GHz, 4MB, 1333MHz FSB, Boxed
 Corsair 2GB DDR2 (2x1GB) PC6400 800Mhz CL4 (TWIN2X2048-6400C4) (bought another 2x 1g DDR ram)
 NVIDIA GeForce 8800 GT xfx 512 mb


So my options are or upgrading my mainpc so it can run atleast run 4 wow's smooth, 5 if possible so i can ditch the old pc. But since i allready filled the 4 ram slots with 1gig each, for example, i'm not sure how smart this move would be.

The second option which i prefer, buying a second pc who runs 3 wows smooth. Since i still got a good pc, which i'd like to use if this saves me money.

Budget is what is needed pretty much. The cheaper, the better still. I allready read quite a lot about hardware stuff, but i still don't have any idea what is required exactly. I'm pretty much a noob still, concerning hardware. As far as my knowledge gets me, my guess is that buying a pc which runs 3 wow's smooth would be the cheapest(best) choice.



Thanks