I figure this could hypothetically limit my collection to less than 20

Team Associated: RC10, RC10 Graphite, and RC10B4
Tamiya: Avante, Hotshot, and Astute.
Yokomo: 834B SE, 870c, YZ10 (93).
Team Losi: JRX2, XX4, Kinwalds 1997 2WD winner.
Kyosho: JJ Ultima, Turbo Optima, ...,
Schumacher: Masami Cat XLS
JConcepts: BJ4