How much is this computer worth?

I'm looking to sell my used Dell and I was wondering what it might be worth. Its a Dell Dimension E510 that I've had for a year. I think it was worth about a thousand, maybe a little more, when I bought it new. Here are the specs:

Windows XP media center edition

Pentium D 3.2GHz

2 gig RAM

geforce 7600 GT 256MB

250 gig HDD

500W PSU

The upgrades Ive done personally (not included in the initial value) was to add a gig of RAM (it was originally only one), add the 7600GT, and the 500W PSU. let me know what you think.

$600.Large_Soda

I Agree around the $600 range

$1.

Anyone see that stupid guy on TPIR that bid $250,000 on a Showcase Showdown? After the crowd booed him he realized that was way too high and then changed the bid to $60,000. Still $40,000 too high.

I just threw together a very very similar rig to just have an extra box at home.

P4 631 3.0
2gig DDR2-667
8600GT
250gig hard drive
400 PSU
Some LG DL DVD burner
Arctic Cooling Freezer 7 Pro HSF

All that brand new for about $550 Canadian, roughly $500 US. And all that was new...so yeah.