4 gigs is a sweet spot for any system these days. I vote for spending $110 to upgrade from whatever is stock to 4 gigs. Don't waste the money on the single DIMM upgrade - unless you go to 8 gigs right away, you are missing out on dual-channel performance gains.
Make sure your OS is 64 bit, otherwise only 3.something of the 4 gigs will be usable.
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-Scott
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