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I don't know how much swap space the 2GB machine has set up (distributions made to run from flash often minimize flash read/writes), but with 512MB of RAM, it would tend to use swap space (if it exists) a little more, so this would limit the performance of the system a bit. Typically, a Linux system is set up with double the RAM in swap. Of course, the X windows system runs well on a lean system. If you tend to open several applications, or multiple browsers/tabs, though, you are going to be considerably more likely to run into a limit. A 4GB system would allow considerably more extensibility application-wise, as well. I would imagine that possibility of upgrade would be quite an asset to the pc and would enhance its value. It is up to you to determine whether the extra cost is worth a little extra "future proofing."
Caveat: I am no eeepc expert, I have not even seen one yet. Just a part-time Linux and PC hobbyist.
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