Most dealerships use KBB to value a car when trading them in - that price of 6,600 is a good price for an "employee discount" wholesaler probably would end up paying a little/alot less than that depending on how much they took it in for
Kelley Blue Book
^^ that is what the dealer would show you if you were a customer coming in - seems the price is good but remember cars value always goes down as the years pass so it depends how long you're keeping it for but that is a damn good price and if you were thinking of financing that/paying cash i would take it in a heartbeat if i had the funds.