Here is my list:

USGT/21.5 Sedan
Speedcontrol: Hobbywing Juststock
https://www.amainhobbies.com/hobbywi...112000/p464566
Servo: Savox 1251MG
https://www.amainhobbies.com/savox-s...1251mg/p183313
Battery: SMC True Spec Premium 7.4V 7200mAh
http://www.smc-racing.net/index.php?...product_id=397
Motor: Motiv 21.5 Mcode 2
http://www.teamgravityrc.com/store1/...egory=15430109
Tires: For our track Sorex 28 premounts with black insert is best.
https://www.amainhobbies.com/team-so...93952?v=386596
Chassis of your choice. You can pick up used touring car chassis cheap on the forsale thread on RCtech.

GTR
Speedcontrol: Hobbywing XR10 1S
https://www.amainhobbies.com/hobbywi...112751/p579727
Servro: Depends on your car chassis but Savox SH-1250MG or futaba 9650 a good choice.
http://www.ebay.com/itm/Savox-SH-125...0AAOSw~OVW08Jb
Battery: SMC 5800mah 1S
http://www.smc-racing.net/index.php?...product_id=340
Motor: Get any 1S specific motor. Like Reedy Mach3 1S 17.5.
https://www.amainhobbies.com/reedy-s...asc269/p456807
Tires: CRC GTR tire. Only need one set. The last a very long time.
Chassis: Any 200mm pan car chassis will be ok. I highly recommend the CRC Gen-X 10 RT - World GT-R chassis.
https://www.teamcrc.com/crc/modules....prodID=7719728

Feel free to message me for more information. Please note that these two list are not the cheapest or the best but the equipments listed good enough to allow you to be competitivity.