Hard to tell without pics, but here it is off the top of my head (conservatively):
The mag is probably at least $100-$120 with the barrels.
Not sure about the warp feeds (I never owned one) but I think they go for around $50.
Trigger kits usually fly for about $30/35.
LVL10 kit would fly for $70 or $75.
I can't tell with the parts kit w/o pics, but probably around $25 or 30 conservatively.
With everything at the above prices you are looking at about $325 retail, so I would start pricing at $300 shipped and see what happens. Might take a little while to bite, but you would have everyone and their mom trying to part the parts kit, trigger kit and lvl10 kit!
I buy and sell mag parts..
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