I'm trying to buy a laptop but I don't want to throw down a lot of cash on it. I've done some research but I'm still not sure which one is best. I have to buy it from my local Walmart so I've narrowed it down to these 3 in stock. Any help would be greatly appreciated.

1. HP 15.6" 2000-314nr Laptop PC with AMD E-450 Accelerated Processor, 1.65GHz, 1MB L2 Cache, 6-cell lithium-ion battery, 4GB memory; 500GB hard drive

2. Gateway 15.6" NE56R10u Laptop PC with Intel Celeron B820 Processor, 1.70GHz, 2MB L3 Cache, 6-cell lithium-ion battery, 3GB memory; 320GB hard drive

3. Acer 17.3" AS7250-3821 Laptop PC with AMD E-Series Dual-Core E-450 Processor, 1.65GHz, 1MB L2 Cache, 6-cell lithium-ion battery, 4GB memory; 500GB hard drive