Best deal on a 904?

I got a couple quote from the local shops today. One said 1800 for a rebuild with a stock converter with a 3yr 36k mile warranty and the other said 675 with a stock converter 1yr 12k warranty.

I wanted to try/attempt and do it myself but have never dug into one before.

904s are the easiest transmission to rebuild......1st tranny i did was a 727 watching a video back in 2004...the video walks you thru it.....the 904 is almost identical inside except for the front pac has one large spring instead a bunch of little ones...If you have any mechanical ability you can handle it....watch this video....
hardest part is compressing from clutch spring...and R&R pump bushing bushing...front drum bushing and tail shaft bushing..
If I buy a kit I buy the Transtar Deluxe kit....you will still need a rear band and maybe a few other parts depending on the condition of your trans...
Now I have 5 904s that are in bracket cars....plus one spare.....I keep enough parts to rebuild a 904 on the shelf also...I buy my parts bulk now...
This video looks like the one I copied from VHS to my computer and someone posted it on you tube...