Which one is better? Thanks

Both are refurbrished, in mint condition.
Purpose: Playing games, web browsing.

Dell M6300 workstation

C2D Extreme X9000 2.8GHz (6MB Cache 800MHz FSB)
2GX2 DDR2 800
160G 7200
1920X1200 17寸 WUXGA
FX 3600M 512M graphic card
Combo drive

DELL XPS M1730

C2D T7500(2.2GHz)
4GB(2Gx2) DDR2 Ram
1920X1200 17寸 WUXGA
160GB 7200
Dual NVIDIA® GeForce® 8700M GT graphics with NVIDIA SLI Technology
DVD+-RW

The price of M6300 is NTD$3300 higher than XPS M1730

Thanks