q45 brakes

[tak-]

I am asking the opinion of some of you out there. I Just pulled the front brake calipers/brackets off a q45, got the pair for $20. They want $30 for both rotors though. Is this worth it? They will not be installed for quite some time, but i would rest alot easier knowing i had the full set, and if i opted to get them later...they may be gone. So is $30 too much for used rotors (in good shape), or should i go get them? I dont wanna spend money if i dont use them either(i.e: come across a deal on some rotoras or brembo's or something).

Next thing i want to know is....are the back brakes worth taking? I have heard yes's and no's, but nothing really solid in the form of an answer, any suggestions would be appreciated, and at the price they charged me i figure it cant hurt.

thanks