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You sir are sitting on a small gold mine.
Ultramaxxed gear sets were selling for ~$400 at one point, though closer to $200 is about right these days since the new emaxx came along with it's much stronger tranny and gears.
There are always guys looking for GorillaMaxx chassis and the erevo version is highly sought after, easily worth $200 or more on it's own.
Not sure about the Torpedo chassis, very rare but you see so few of them, hard to put a price on it- if you advertised it on the large forums like URC, RCTech and RC Universe I'm sure there would be plenty of interest, though ebay may be best to reach a wider audience.
The Gorillamaxx transmission would sell for $80+ no trouble at all, though it might be worth sell it with the remaining Ultramaxxed gears as a bundle ( with a new input shaft and the rear of the tranny case, cheap to find on ebay )- you can make your own sprong quite easily though:
http://www.rc-monster.com/forum/show...4&postcount=17
http://www.rc-monster.com/forum/showthread.php?t=9341
The UE truck as a whole would sell well for certain, UE stuff is always popular with guys looking for parts or whole assemblies- the new emaxx still has crummy diffs so there are loads of guys looking for 1/8 scale driveline items.
I think keeping the emaxx as a basher would be cool, sell off the G2r chassis which would fund the electronics for the emaxx if needed ( do you need a new motor and esc & batts, or just...? )