Fred,
Depends on what he needs. The Legacy 360 PowerMaster is no where in sight, so if he needs more power to the track than the PowerMaster's 180 watts, his only choice for the foreseeable future is the TPC300 (270 watts) or the TPC400 (360 watts). I currently run TPC400s with my Cab2, but will swap them out whenever (if?) the 360 PowerMaster shows up. I do recommend that anyone using more than 180 watts gets a fast CB like the PSX-AC to ensure no damage to the trains during a derailment.