Which configuration is best?

While I'm trying to figure out why my computer is broken, I'm going to buy a new computer. I'm on a budget of ~$400, and I cannot build my own right now. The computer will be used for basic office tasks. While looking at Fry's, I compiled a list of my possible choices. I can provide more info or links to each of these upon request. Please let me know which is the best and if the price is fair for a retail store. Also, is refurbished a good option?

Price.......Brand................CPU.............RAM
$330 Lenovo..................E2220............3GB
$330 HP Refurbished........5050e............4GB
$340 HP........................9150e............4GB
$350 HP Refurbished........5000+............3GB
$360 Acer......................X2 II 215........3GB
$360 Compaq.................7550+............3GB
$370 HP Refurbished........7750+............4GB
$390 Compaq.................X2 II 215........3GB
$400 Acer Aspire.............X4 9650........4GB
Eliminating poor choices will help too.

X2 II 215? what cpu is that?

I assume that none of these store bought computers are easily upgraded, so should I even worry about the chipset? What else should I look for in it? Right now the $360 Acer is looking good to me, but I'm still not sure if the X2 215 is better than 5000 or 7750. I also like the idea of the Acer with the Quad Core. Any comments are appreciated.