Yeah, that's ridiculous. Unless you're getting a ton of custom work, that's way too much money. By custom work, I mean extensive fiberglassing, and aesthetic work.
Are you coming back from Iraq with a lot of cash? These guys may know that and are trying to get as much as possible from you. If they're around a military base, then they're probably no better than the used car dealers you have lining the streets of the main drag. Never buy a used car within 25 miles of a military base, and the same with car audio.
Again, like somebody else asked, what kind of vehicle is it?
Also, the prices of those speakers should be no more than $1200.00 combined, so they're basically quoting you $1400.00 in installation costs. You want to give me $1400.00 to do that work, I'll pay for your gas and give you a place to stay up here while I do it. In other words, it's ridiculous.
Get an itemized list of their installation procedures. There's a lot that goes into installing a front stage. Are they planning on using stock locations? How do they know what they'll sound like in those locations. Because there's a location doesn't mean it's optimal for that particular speaker. Dash speakers are particularly hard to deal with as reflections from the windshield can be somewhat harsh, and difficult to tune out. How are they treating the doors. For that money, there had better be several layers of deadening, and a lot of MDF, resin, and other substances to deaden that door as much as possible.
The rear fill is just a way to get you to spend more money. Any reputable shop knows that a high priced component set is designed to stand on it's own, and provide the best possible front stage. Again, they're screwing you. Putting those K2Ps in the rear locations is a complete waste.
Back up a bit and rethink what you're doing. This shop should not get your business. They're playing you for dumb.