Seems like where I'm at (SoCal) the hot tires are Sorex (28R, 32R, 36R), TakeOff (CS27, CS32), Yok 138G or 139G, and Pit (haven't used them but whatever is in the 28 to 36 range). Inserts range from HPI Red, HPI Greens, Yok Med, Yok Firm, Yok Thin Firm and TakeOff inserts (included with tires).
The combos I currently have and run are:
Yok 138Gs - Yok Firm Fr/Med Rr
HPI 33R - HPI Red Fr/Red Rr
HPI 27R - HPI Red Fr/Yellow Rr
Sorex 32R - Yok Firm Fr/Med Rr
TakeOff CS27 - Included inserts