Good cars: Corally SP12m, AE 12L3, Trinity Switchblade, CRC Six-Pack, CRC CarpetKnife, SPEEDMERCHANT REV.3. I listed them from worst to best, as I rate them.
I personally don't like T-bar cars because of the T-Bar and the inconvenience of taping in batteries. I prefer the Rev.3 over the CarpetKnife for several reasons, adjustable battery position, slightly longer wheelbase, different rear suspension geometry, and the best personal support from ANY manufacturer.