How much trade-in credit can I get for my guitar rig?

I'm looking to trade in my guitar rig at Guitar Center and I was
wondering if anyone could tell me a vague idea of how much trade-in
credit I could get. I'll list the items in my rig, their condition,
and how much Guitar Center sells the item (or a similar one) for.

-Epiphone SG G400, Okay condition (7/10), $350
-Epiphone LTD Ed Wilshire Pro, Mint (10/10), $400
-Crate 65 Amp, Very Good (8.5/10), (New version $300)
-Boss GT3 Multi Effects Pedal, Near Perfect (9/10), (New version $500)

Please tell me how much money/trade-in credit you think I can get for
this rig

All of this new would be $1550, so do you think it's unreasonable to
think I could get $800-$1000 for the rig?