Acer Aspire 4730ZG, Dell studio 1435, COMPAQ PRESARIO CQ45-107AU which one is better for photoshop cs4 & medium gaming?

Acer Aspire 4730ZG,
Intel Dual-Core Processor T4200
4gb ram/250gb HD
Ati Radeon 3470
DVD super multi double layer
Vista home premium
RM 2199

Dell Studio 1435
Core 2 Duo 2.0
3GB ram/250 GB HD
Dvd rewriter
Free Dos
RM 2499

COMPAQ PRESARIO CQ45-107AU
AMD Turion X 2 2.0ghz
14.1 screen
4gb ram
320gb HD
DVD-+RW dual layer
ATI Radeon HD3200 256MB
Built In wi-fi
5 in 1 card reader
RM 2509