well i replaced my clutch at 67k with a Luk clutch. it wasent really anything special it was pretty much oem style. i was pleased to see that that luk clutch kit came with an exedy pressure plate. now my car has 87k miles on it its still going strong. im not easy on it either. i autocross with my car quite often so it doesent see the easy life. it still grabs 2nd with plenty of tire spin so i think u may have just gotten a bad clutch. and paying 650$ for a clutch job! wow that really stinks try to find someone cheaper or just try to get a lift and do it urself
thats what i did. its also a good time to look at ur flywheel and see if it needs turning. that may be ur problem. best of luck