Hey Aluma,
might as well put my 2 cents in even though you're looking to buy my rally.....
1.tl01 LA forget about it... the tl01 was never meant to be a rally chassis. Tamiya makes the Baja Champ buggy using the TL01 main chassis if you want to go that way
2. TB01 with long arms......Good,I have one....but the longer arms are primarily for handling. The shocks remain the same so shock travel is still short.
3 TC3 with conversion....haven't tried it...but I imagine it's much like the TB
4. Purpose built rally car...lots of shock travel. if I weren't hard core Tamiya...thats what I'd use.