The few odd internal tools needed are only about $250.
Full banner kits are about $230, not including bands as they do not really wear much. Bulkpart.com is about $430 for it with bands.
http://www.bulkpart.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=2&Category_Code=722-3
Also, I would skip a reman torque converter. There is really nothing to die in these as there is no lock up clutch. I mean the internal bearing may die, but chances are pretty damned low.
I would not trust a $350 'good, used' trans the way these wear. Even 100k ones can have a pile of city driving and have a near dead reverse clutch pack... putting you right back to where you are now.
Most of the total cost involved it is the removal and reinstallation.