Dude, $900 with a new clutch, and installed in the car, thats pretty good.
The cheapest I could find for a T5 conversion, everything included was $600, but with S/H clutch and not installed.
I suggest that if you are going to pay someone to do the install for ya, then I doubt you will get a deal that is much better.
Once you have the T5 in, you can sell your 4 speed for quite a bit i'd say.
CAUTION: Slippery When BOOSTING!