Kenwood,
Chassis:
Complete car kits -- Hyperdrives, KSG, Custom Works (new), Associated L4
Associated L4 conversion kits out there.
The Maverick, KGB Sniper, Silva X-Factor 4 (new), Leading Edge car.
I have seen every kit on the market fast in the right hands.
Most are offering both slider chassis and solid chassis cars.
The sliders seem to work better on flat carpet and cap tire tracks.
The solids work great on Banked carpet and asphalt foam tire tracks.
Classes:
The popular classes are 4 cell spec (1600 mah spec batts and 21T Trinity spec motors)
4-cell stock - 27T motors (most popular the Trinity Monster stock and Epic Roar stock)
4-cell 19T - ARCOR/ROAR based Epic motors with standup hoods
4-cell mod
Batteries:
GP has been in the market for about 2 years now and are the hands down leader.
Everyone runs their 3300mah cells. As far as matchers go there are so many now that offer great cells.
SRC, SMC, KC, Promatch, TQ cells, Hefty cells, Whiplash, etc etc
Chargers:
High dollar: The new Futaba, discharges at 40 amps, no motor run in though
The CE Turbo 35 GFX, pretty much the standard every oval racer has, 35 amp discharge, motor run in feature.
Middle range - LRP Pulsar competition, Integy chargers (many diff price ranges), Reedy Quazar, Yokomo
Stock and 19T is deadshorting their packs, mod does not short.
Speedos:
LRP Quantum 2, Keyence Rapido Pro, Novak GTX, GM, KO, Futaba (knockoff of the LRP Quantum 1)
Tires:
BSR, Jaco, TRC, rc4less, Murdock, TM Tires
Bodies:
Protoform, Mcallister, Bandit, CDI (former Bolink, but no one has heard from them in a while)
That pretty much sums it all up.