I like to have Cityblocks and Gridirons in both soft and medium from AKA, and Calibers, Holeshots and Bowties from PL in M2 and M3.
Don't forget JConcepts, which may have the best wear characteristics of them all.
I like to re-use wheels and inserts, and I find the AKA wheels to be a bit flimsy. Love the Losi wheels.