The RAM upgrade for the Aspire One AO522 will take the price to $340.
For just $30 more you could get the HP Pavilion dm1z 11.6" @ $370
AMD E-350 1.6GHz dual-core AMD Fusion Laptop, 3GB RAM, 250GB 7200rpm HDD, 11.6" 1366x768 LCD w/ HD 6310 graphics.
A major upgrade in CPU performance, 9.5 hrs battery life, a keyboard big enough to really type on and only .75lbs heavier than the Aspire One AO522. HP Pavilion dm1z review