Well generally I would tell you, more important to your game than the processor or graphics chip, is the amount of RAM each has. TW games have tons of stuff running around the field. If you have the processing but not the memory it'll choke at particular points. In terms of spending, I'd opt for more memory... slow but steady is easier to tolerate than zips and hangs.
My graphics card is a 6600, not hugely impressive but it has 512 MB on it and it stays steady.
Also, have you tried cranking down the unit sizes as small as they'll go?
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