I would suggest getting a hold of Orangefj45(Georg). I bought my 700r4 from him and had his buddy run through it. Great job on the rebuild. A decent rebuild could run $750-2200 depending on if anything is wrong and type of valve body/parts.
I'm not running this currently cause I'm saving away for the full 6.0L Vortec-700r4-stak drive train swap. 1 part at a time on a budget.
However, in long conversations with him and others I suggest a seperate tranny cooler with a fan. Spendy at first, but heat is an auto's worst enemy. If you plan to run this on the highway then stay non-manual body. Otherwise the manual can give you some issues on the street regarding constinently shifting like a manual tranny. Get a good torque converter for your set up. This involves a ton of research.
I second the line-lock for a parking brake set up. Cheap and easy.
Best of luck
,
Campy