TH is the only person I'd buy a rebuilt trans from, anyone else hasn't burned all of the constant revisions from Ford, and which ones will work together or not into their head.
If one could get the Roush trans for what it went for in my GB, it would pay off. To have a zetec FD installed, the correct version is needed. TH charges $250-$300 for that alone, and that's at selling the part at cost and charging a fair flat fee to install it. Anywhere else it will cost even more.
It already has one, so all it 'needs' to be up to par is an LSD and shift forks installed and you have a brand new transaxel all around. The correct focus shift tower or even a mod'd OEM shift tower would also be a good idea.
Just my opinion though
TH would be good to ask and would tell you the best route to go and personally I would go which way he advises.
PM sent