Well usually you hear T-bars cars are more suited to asphalt racing rather then carpet, and link cars are more suited to carpet racing rather then asphalt. I put the 12L4 before the 3.2 only because its the same general design as the T-Fource, only less tuning options. The 3.2R can be setup to run well on asphalt, and if memery serves me correctly Marc Rheinhard and Jilles Groskamp used 3.2's on asphalt and did very well with them. IMHO you can't go wrong with any of the three you've listed...