How much could I get for my Cyberpower Xplorer? * Xplorer

My friend is interested in buying my Cyberpower Xplorer that I got from PCS.Freepay.com a few months ago. How much do you think I can charge him for it? I added 1GB of RAM, and a 150GB Hard drive

http//pcs.freepay.com/Content/Admin//Products/8/383345_Image.gif[" alt=""/img6af7bb87b0]

li Xplorer mid-tower case 420W w/window & LCD temperature display
li Black case w/silver face
li 12" Cold cathode neon light (blue)
li AMD ATHLON 64 3000+ w/ HyperTransport Technology
li [b6af7bb87b0]1.5 GB PC3200 400MHz DDR memory[/b6af7bb87b0]
li 80GB 7200 RPM ATA 100 hard drive
li [b6af7bb87b0]150GB hard drive[/b6af7bb87b0]
li NVIDIA Gefroce 6200 w/TurboCache supporting 256MB 16X PCI express video card
li CD-RW 52X32X52
li Internal 6-in-1 flash media reader/writer
li High definition on-board 7.1 audio
li Microsoft Windows XP Home Edition w/SP2

I was thinking around $600 or so since the RAM + Hard drive cost me $120 alone

$700

750 you need to make some profit

i made my friends computer with a nicer case, 3200+, 1 gig of ocz gold, 160 gb hard drive that has decent stats, and an evga 6600gt for only 650 so iono... 700 sounds fair, i guess