I don't know about who does what local. As far as I know RRE doesn't to transmissions anymore.
If you want a top notch build Project 2G already mentioned two leading shops. As I see it this is the list of the leading three.
1.
TRE I have had a great experience with them and I love my trans.
2.
Shep Transmissions They make them to hold big power.
3.
Jacks Transmissions They seem to be a little cheaper than the other two and people have had good things to say.