I'd say $1500 or less I have to work in UK prices but the conversion is usually straight for computer equipment (i.e. £1 == $1 US) The other posters who've pointed out that your upgrade options are limited are completely correct - the 775 board you have in there is pretty much maxed out with a C2Q in it (and is obsolete as far as Intel are concerned). The above is not to say that an upgrade is out of the question though - you could easily keep your existing case, RAM, PSU and HDD (plus any other bits that aren't soldered onto the motherboard!), just upgrading the RAM, CPU, Mobo and OS to something more current. There are two options I would consider: a recent (i.e. Ivy Bridge Socket 1155) Intel Core i5 processor with an SLI/crossfire capable motherboard (options there for future upgrade to Core i7 and dual gfx cards should the need arise) + additional RAM (can't see how your RAM is configured in your current system so you may have to replace the lot if it's in 1GB sticks) AMD FX processor (opinion is divided on these, they tend to be a little behind the Intels in pure performace but can save a little money) with an equivalent SLI/crossfire motherboard + RAM as for the Intel I personally went for the second option and will be upgrading my gfx from my current GTX460 later this year, got the added bonus of SATA3 and USB3 ports on the new board for any future upgrades. The operating system "upgrade" (you will have to do a clean install!) - some retailers will sell you an OEM (cheaper) version of windows as long as you order it at the same time as your hardware - you may even still be able to get Win7 from some too. Beyond this my only advice would be on gfx cards: if you go nVidia avoid anything that has a second digit lower than a 6 for gaming! (example: GTX640 is worse than a GTX560 despite being a newer card) Can't advise you on AMD/ATI gfx as I fell out with those years ago! (they may have improved since but once bitten, twice shy when it comes to crap drivers and poor AA performance) EDIT: As for building it yourself - not that hard really... the only tool you need is a crosshead screwdriver, it's not physically possible to plug anything in the wrong way around or in the wrong hole nowadays and itwill be cheaper than a complete new rig :)