Help me decide between these 3 laptop configs

<p>[Satellite</a> P770-BT4G22 Laptop](<a href=“http://www.toshibadirect.com/td/b2c/cdetland.to?poid=2000005971]Satellite”>http://www.toshibadirect.com/td/b2c/cdetland.to?poid=2000005971)</p>

<p>Satellite P770-BT4G22 $884.00
Intel® Core™ i7 Processor (quad core)
Genuine Windows® 7 Home Premium
6GB memory
640GB hard drive
1GB DDR3 NVIDIA® GeForce® graphics
DVD SuperMulti drive
1600x900 native screen resolution</p>