I'm looking to upgrade them so that I can run diablo 3 on the recommended settings. My current pc specs are (prebuilt pc):
Packard Bell ixtreme M5722
Intel Core 2 Quad CPU Q8300 @ 2.50 GHz 2.50 GHz
6.00 GB of RAM
nvidia gt 220
win 7 64 bit operating system
PSU is a delta electronics 250w
The video card that i'm looking at is a nvidia geforce 440 but I'm open to other suggestions. I would prefer nvidia.
I really have no clue about power supplies but people say with the 440 that it ran fine on a 350w stock power supply. I would rather have a 400 - 500w incase I ever upgraded again.
I'd suggest upgrading the PSU now and saving up some more money for a GPU. A really nice PSU in the range you're looking at: http://www.scan.co.uk/products/450w-psu-xfx-pro-core-ed...
I think that GPU prices are going to start falling some as the new nvidia cards hit the street; the GTX680 just tool over the #1 spot for single-card solutions and the rest of the product line will likely spark a price war as AMD/nVidia jockey for position in certain price ranges.
Edit: This PSU only has (1) PCIe power connector and this will limit you to something below an HD6850/GTX560 (these cards and anything higher requires two PCIe connectors). If you want to look at consider a card that requires (2) PCIe connectors, then I would recommend another PSU that has the connectors without having to use an adapter.