Caliper question

[Gary Webster <GARY@synaxis.com>]

I have been informed by my repair guy that my 89 200Q needs a rear
brake caliper.  (The symptoms that I have are that the parking brake
sticks.)  He has tried to fix this before to no avail.  He says that these
should be replaced in pairs and that the options are as follows:
1. new calipers from Audi -  $400/ea
2. aftermarket parts from ??? - $200/ea
3. have mine rebuilt - $166/ea

Is this reasonable advice?  Is there anything else that I can do??

Thanks...