Chiocese between 5 quite similar spec. laptops. Which one shall I go for?

0704

I am looking to buy one of these five laptops but because theirhardware are pretty similar, I can't make the decision. Therefore, Iwould like to see others opinion. Here are they specs. And wouldsomeone please tell me where to buy F8SP if i would like to and howmuch is it?

Asus M50a
Choicese of CPU
Graphics: ATi HD3650 (1GB VRAM)
Altec Lansing Speakers
15.4" LCD

Asus F8Sn
T9300 2.5GHz
3GB RAM
Gefore 9500M GS  512VRAM
250GB 5400rpm HD
14.1" LCD

Asus F8SP
T8300 2.4GHz
4GB Ram
320GB 5400rpm HD
ATi HD3650 1GB VRAM
14.1" LCD

M51Sn
T8300 2.4GHz
2GB RAM
9500GS - 512VRAM
250GB 5400rpm HD
15.4" LCD

Lenovo Y510a
T8300 2.4GHz
Geforce 8600GT
250GB HD
4.1 Dolby Theatre Speakers with Subwoofer