904 rebuild question?

So......do I drop off my 904 at the transmission shop to be gone through ( it worked fine when I took the car apart but could use a sprucing up) or do I spend probably an equal amount of cash here:
http://cgi.ebay.com/ebaymotors/ws/e...0688177561&viewitem=&sspagename=STRK:MEWAX:IT