Chris, I'm not sure about the components, but I understand that 64 bit will make a huge difference in the speed of things.
I find Lightroom runs a bit slowly and lags with 32 bit. I think sperlock has a good point about being ready for a CS5 upgrade, it is inevitable and now is the time to do that 'preemptive' upgrade.
I bought a gaming computer from dell about 4 or 5 years ago even though I don't game. It is still a great performer with CS4 and huge files. The only downside is LR2. Now that LR3 is out I am having to consider some hardware upgrades.
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And now I'm finished posting.
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