I am rebuilding mine with an o-ring kit this weekend.  I got the kit from Corvette Stainless Steel Brakes.  The sell on e-bay at 24 bucks a wheel.  Just have to be certain that you have stainless steel sleeves.  If you have a bad caliper, most parts stores have rebuilt SS calipers in stock.  They are not too expensive, I bought all four last year.  They charge a core, refundable when you give them the ones off your car.  That is unless you want to keep them.  I am replacing the rotors with new ones.  I have all the gages to check runout and will use washers to parallel the rotor to the spindle.  I plan to photo this rebuild and post it as a shark byte when I get finished.  In the mean time, here is a link to a site that shows the basics of rebuilding the calipers.

I had the exact same problem as OldRustyGhost did, except I did all the caliper changes.  Ended up changing all four, and the rubber over to braided steel and replacing the master cylinder and front cross-over tube to finally get all the little gremlins out of the brake system.  (OK, so I broke the cross-over trying to get the old rubber off, it still had to be replaced).

I went with the Stainless from Lonestar Calipers.  Now, she stops on a dime and gives you 7 cents change

Thanks fo all the info.Gives me more than enough to go on.