What's a good Laptop for $600?

[iclim4]

I found this but I'm not sure which one's the best.

http://www.newegg.com/Product/Product.aspx?Item=N82E16834114613

General
Operating System	Windows Vista Home Premium
CPU Type	Intel Pentium dual-core T3400(2.16GHz)
Screen	15.4" WXGA
Memory Size	3GB DDR2
Hard Disk	250GB
Optical Drive	DVD Super Multi
Graphics Card	Intel GMA 4500M
Video Memory	shared memory
Communication	Modem, LAN and WLAN
Card slot	1 x Express Card
Dimensions	14.3" x 10.6" x 1.33-1.51"
Weight	Starting at 5.49 lbs.
CPU
CPU Type	Intel Pentium dual-core
CPU Speed	T3400(2.16GHz)
CPU FSB	667MHz
CPU L2 Cache	1MB
Chipset
Chipset	Intel GL40

http://www.newegg.com/Product/Product.aspx?Item=N82E16834147936

General
Operating System	Windows Vista Home Premium 64-bit
CPU Type	Intel Core 2 Duo T5750 2.0G
Screen	15.4" WXGA
Memory Size	4GB DDR2
Hard Disk	320GB
Optical Drive	DVD Super Multi
Graphics Card	Intel GMA X3100
Video Memory	shared memory
Communication	Modem, LAN and WLAN
Card slot	1 x Express Card
Dimensions	14.05" x 10.12" x 1.00-1.69"
Weight	6.14 lbs.
Other Features	Security: Kensington MicroSaver lock slot Power-on password Accepts 3rd party security lock devices In the box: Mobile Stereo Earbud Headphones (1 pair) HP Mobile Remote Control
CPU
CPU Type	Intel Core 2 Duo
CPU Speed	T5750(2.00GHz)
CPU FSB	667MHz
CPU L2 Cache	2MB

http://www.newegg.com/Product/Product.aspx?Item=N82E16834147920

General
Operating System	Windows Vista Home Premium
CPU Type	Intel Pentium dual-core T4200(2.00GHz)
Screen	16"
Memory Size	3GB DDR2
Hard Disk	320GB
Optical Drive	DVD Super Multi
Graphics Card	Intel GMA 4500M
Video Memory	shared memory
Communication	Modem, LAN and WLAN
Dimensions	14.88" x 9.90" x 1.38-1.72"
Weight	6.57 lbs.
Other Features	Kensington MicroSaver lock slot Power-on password Accepts 3rd party security lock devices
CPU
CPU Type	Intel Pentium dual-core
CPU Speed	T4200(2.00GHz)
CPU FSB	800MHz
CPU L2 Cache	1MB