I recently upgraded my four year old HP computer ( Dual core 2.5GHz, 2gb ram, 500gb hard drive, 9800gt card) and was searching around for a good price tag for constant 60 FPS in open world and ~40 in 25m raids. I was getting around 40 open and 20 raids with my old set up and it was just time to upgrade.
I started looking at sites like alienware and decided pretty early on that it was out of my price range, so I looked into building my own performance PC to achieve a low price tag but cop'd out at the last second on the grounds that changing hard drives and switching power supplies got me bent out of shape, couldn't imagine sitting down for an hour or two putting everything in my case.
I decided to look at commercial computer sites (I know, everyone says they're terrible gaming PCs) like Dell, circuit city & Bestbuy and that I would just stick my old 750w power supply in it and buy a new graphics card. Turns out, this is a pretty good combination;
AMD Athlon™ II x4 3.0GHz - 4 GB Ram - 1 TB Hard drive - Windows 7 premium($465) & A GeForce GTX 460 SE 1 GB ($153) (SE is a slightly toned down version of 460 for $60 cheeper)
I got the FPS I wanted (1920x1080) - Max settings, 60 open world & ~40 in raids
I would highly recommend this to anyone who is considering upgrading their set up but is limited by a budget and, like me, doesn't want to have the parts coming in the mail one by one and having to assemble it yourself. However, the power supply that comes with the computer is a measly 250w and won't be able to support the Video card, but the HP case is extremely simple to open and maneuver in, even if you have no computer experience. Sadly I couldn't post links as this was my first post, but you can PM me and I would gladly send you links and if you're serious, help you pick a power supply and set it up with your new card and tower.
In the end, I will probably upgrade computers like this for the rest of my life; buy a good base from a place like Bestbuy, grab a $200 card & slap it in along with a power supply that can support the card; 5 Mins to put the card/power supply in, 5 mins to set up OS, 2 min to update card drivers? Yes please.