OP: Check into rotors from StopTech and DBA with a different set of pads.
Comming from the Subaru STi world, that car uses a 4 piston Brembo brakes on the front and it's the same deal, people getting quoted crazy prices for replacements.
The truth of the matter, you can get some aftermarket rotors (brands I just mentioned) with great pads, and even upgrade to stainless steel brake lines for less than $1000.
The Brembo stuff is EXPENSIVE, especially from the dealership. Don't panic and sell the car because of what the dealer quoted you, just research it out and you'll find great alternatives.
* If you're doing Stainless Steel brake lines upgrade, make sure to check what brake fluid your car calls for before swapping fluids with aftermarket fluids. Different brake systems have different needs.