Price Advice: Help pricing a used 2009 iMac

[ppedulla75]

So its time to retire my work- horse 2009 Imac.
It's a 2.4 Ghz, 24 inch screen, with 4 gigs of RAM and 300 gig HD.

It works fine, the DVD drive is fine ... no real qualms except for some yellow streaking on the screen. I think it would find a good home as a student computer, light Photoshop, iLife, etc ...

I'm upgrading because I'm doing a lot more After FX work and need some extra horsepower...

I'd like to sell it to help fund a new Imac .... what is it worth?

Again everything is working fine, except for the yellowish streak on the screen (that over the years has driven a bit nuts). But ultimately its really been fine.

I've seen similar system from $500 - $900.... just trying to figure out what is fair to ask?

Any help would be appreciated ....