What's your processor and what are you actually going to be running? imo if you aren't using programs which are actually optimized for it, there's no point and it's a waste of money.
I'll be doing a lot of multitasking, with things like games in windowed mode on one screen then firefor and Photoshop on another
Processor is AMD Pheonom II 965 BE 3.4Ghz Quad