Buying laptop - need help

[mcheinrich]

hello, my sister resently got into some money, and decided that she wanted a new laptop, i was given a budget and isolatet these

http://www.proshop.dk/Baerbar/ASUS-K53SM-SX015V-15.6-2321540.html

http://www.proshop.dk/Baerbar/ASUS-K53SK-SX032V-15.6-Core-i5-2450M-Windows-7-Home-Premium-64-bit-6-GB-RAM-2321586.html

http://www.proshop.dk/Baerbar/ASUS-K73SV-TY285V-Core-i5-2430M-2.4-GHz-2328330.html

http://www.proshop.dk/Baerbar/ASUS-K55VD-SX033V-2328152.html

i was hoping that someone could help me decide which one would be the best. it is going to be used as a mid-range gaming laptop

 

[xtreme5]

ASUS K55VD-SX033V

 

[SomeoneHM]

Just my 2 cents, im not very PC savvy.
Gaming
ASUS K53SM > ASUS K53SK > ASUS K55VD

CPU performance/heavy tasks
ASUS K55VD (like twice of the others) > ASUS K53SK (slightly better than the K53SM because of the ram) > ASUS K53SM