I actually use mostly 3 racing upgrades because I can get them a lot cheaper from Hong Kong than I can here in the US. I'm using the 3racing diff halves and like them very much except for the blades that come with it. They are very cheap and don't last very long, but the HB blades can be hard to come by so they will do when needed. I am also using the 3R center pulley shaft with one 3R pulley and one plastic kit pulley. I know why not 2 ... just cause I wanted to try it first and then ordered one from my LHS which they haven't gotten in. Really the only reason I switched is because I wanted more purple and was ordering other stuff anyway. I didn't strip any plastic pulleys until I got the 3R motor mounts... the plastic shim on the center shaft is a little big so when I took it out there was a little slop which I'm sure was my problem. Need to get it shimmed properly.
I also use the 3R uni's and they work good, but not as strong as the HB ones. But for $12.50 US a pair its a lot easier on the wallet to replace.
As far as diffs go there was a guy on here bxpitbull that had a guy that could make up some T1R diffs halves. I know he got them and liked them and I think they were like $31 for 2 sets (F/R). That's about the same price as I got my 3R's. Suppose you could PM him and see if that deal is still possible.
Here's the 3R Parts I use for the drivetrain
CY-08/PU - Aluminium Ball Differential For Hot Bodies Cyclone - Purple Color
CY-10/PU - Supr Gear Adaptor For Hot Bodies Cyclone - Purple Color
CY-14 - Universal Drive Shaft ( Original Hot Bodies ) For Hot Bodies Cyclone
CY-17/PU - Aluminium Belt Pulley For Hot Bodies Cyclone - Purple Color
I have a big race coming up this weekend so maybe I'll remember to take a picture of my ride so you can kinda see what I've done. Doesn't look much like an "S" anymore but its fun knowing that's what it started as.