Tough call. Do you really like red? If not, consider returning the red one and buying the upgraded black one. Although check with Lenovo first and make sure there is no restocking fee on returns or you may loose some money by returning it.
If you are feeling adventurous there have been a couple of people on this forum who have expressed interest in the S10, but can't buy it since they are not in the US or Asia. You could probably Ebay it and get a bit more than you paid for.
Ruby Red Lenovo IdeaPad S10
Upgrades: 2GB RAM, 320GB Hard Drive