That is a royal screwjob for the brakes. NAPA sells a set of premium ceramic pads for the back for $57.49 and they come with shims. They also have new rotors for the back at $30 a piece.
Brake Parts Cost - $117.49
Ease of Work - Very easy and fairly clean if you don't have to bleed.
NOTE - They will use very cheap pads whenever they can get away with it, this way you are getting premium pads and you know it was done right.
STABLIZER BAR
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Most of the time, the bar is fine, but the links are screwed up or broken off. My Lincoln had a broken off Link and the dealer quoted me at $150 if all went well. I did it in a half hour, and the part was $30 at NAPA.
Stabilizer Bar Links - $54.98
HERE
Ease Of Work - I had never done this before and it took me a half hour to take off the old and 10 minutes to put on the new. Just follow the Factory Shop Manual that is at **********'s site (Sticky at top of page).
VALVE COVER GASKETS
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You Having a latitudinally mounted V6(Cylinders go left to right) means that the back one is going to suck to change. I have a longitudinally mounted V8 (Cylinders are front to back) that it would take me an hour to get to them, where as you it is a giant PITA and they are not ripping you off, however do the front one yourself.
Cost - Anywhere between $200 - $400 depending on if you do half.
OIL PAN GASKET
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I recommend buying the Felpro cork oil pan gasket and having them change it. If you had them quote you, most likely you haven't done this before. It will take quite a bit of time to do, and the price they gave really isn't bad.
Cost - $195.95
HOOD CABLE
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I really have never had a car have this go bad, but it should be fairly simple to replace. Shop around, that is really not that good of a price.
Cost - $185.95, but should be less elsewhere.
BUSHINGS
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Read the manual on **********'s page and it really isn't hard to do.
Cost - $14.49 each at Napa.
TOTAL - $983.35(worst case) or less if you can get some of the other work done for less.
I would personally do all of it myself and save a lot of money, but if you don't have the time or skills, this is a fairly good route to take.
Good Luck,
GT6