Help picking computer set up

I am by no means a computer afficianado but heres my situation

Which set up would be better? I game a little Final Fantasy XI and Star Wars Galaxies... I might play the New Star Trek MMO


Intel® Core™2 Quad processor Q9550 (12MB L2, 2.83GHz, 1333FSB)
2GB Dual Channel DDR2 SDRAM at 800MHz- 2DIMMs
320GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache™

its a dell @ 599



or this

Intel® Core™ i7-920 Processor(8MB L3 Cache, 2.66GHz)
3GB DDR3 Tri-Channel SDRAM at 1066MHz - 3 DIMMs
500GB - 7200RPM, SATA 3.0Gb/s, 16MB Cache

another dell @ 799



My wife photo edits with Corel PhotoShop X2 (But usually from her laptop not 2 much on my PC)
So this is more for just my college coursework, email, downloading music, and some gaming