[quote='Bovidae',index.php?page=Thread&postID=20610 8#post206108]Everything else aside, the 250 is a more powerful gpu than the 9400gt. I wouldn't give the extra video RAM more weight than processing capacity.[/quote]And the 250 is just a rebranded 9800 variant.

You don't need to spend a THOUSAND dollars on an i7 computer just to dual-box.

First, have you turned down all the settings on all of your clients? Tried scaling the game resolutions down? If you do things right you can get more performance out of your machine without having to buy a new one.

The rest of your system is fine. I'd say your processor is holding you back.

Try this:
[url='%20http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.197499']
Wolfdale 3Ghz CPU + Motherboard Combo from Newegg - total = 269.98[/url]

With that you get a solid processor, can upgrade to a quad-core later if you so wish, and you could re-use almost everything in your system. (Power supply/RAM may be an issue if it was a pre-built computer)