[quote name='swim83']Well I did the permanent fix for that by taking apart the Xbox and putting new thermal paste in
there and what not. I'm not sure if that decreases value or not[/QUOTE]
As far as launch consoles are concerned, there is no "permanent" fix unless you replace the first-gen heatsyncs and put in a better fan...or do something crazy like liquid cool the thing... With stock cooling fans and first-gen heatsyncs it will RROD again guaranteed, only a matter of time. Once a launch system has RROD'ed it is doomed to happen again and again. It may run for a week, a month, or a year after the fix, but it WILL RROD again. Also, the fact that it has been opened hurts the value and may make it harder to sell.
Anyway...
A working launch console is worth about $60 - $70 with cords. Maybe $75 - $80 with a 20GB HDD.
The problem is that since it has been opened the warranty seal under the faceplate has been broken. Since this sticker is broken or missing now, Gamestop will not take it...just as well, many people will refuse to buy it if they know that seal is broken. All you gotta do is pop off the faceplate and look...
Your best bet is to sell it for like $80 (if you can get that much) on Craigslist. Gamestop would only give you $50 to $70 for it anyway, and that is with it unopened and the warranty seal intact (and with a controller).
Opened launch Xbox 360s are dirt cheap (ones without HDMI). I can buy opened rrod systems, console only, for $20 - $30 bucks (maybe $40 w/all cords and HDD)...then fix them and resell them for ~$75 with cords. The fact that you did the fix yourself actually hurts the value since you probably did not do it professionally with a heat gun or reflow station (you probably just replaced the thermal paste and maybe overheated the board by running it with the fan off...hopefully you at least got rid of the x-clamps and bolted the heatsyncs on w/M5 bolts). It is extremely likely to red ring again when "fixed" improperly (and launch consoles have about a 40% failure rate as it is, which is EXTREMELY high).
IMHO your best bet is to Craigslist it and hope someone who doesnt know much about Xbox 360s wants to buy it...and doesn't ask too many questions, heh.