If you run at tracks where holeshots work, pick up a set of blockheads. They just feel a bit more consistent for me. I have a set of (rare) front Sprints from Losi, they seemed to work anywhere.
I take with me always these (to a new track):
Rear Tires:
Panther Pumas
Losi Big Shot/Ifmar Pins
Losi Ifmar Studs
Losi Taper Pins/Panther Switch
Proline Holeshots
Proline Bowties
Front Tires:
Cut Panther Pumas
Cut Losi Big Shots/Ifmar Pins
Losi Ifmar Studs
Losi Taper pins/Panther Bobcat (I think)
Proline Holeshots
Losi Sprints/Blockheads
I usually carry a set of X-2000/3000's with me, BK Bars (I have a track I run on that uses them anyways) and anything odd or weird I find (currently I have some Tamiya Dark Impact tires, nice design, but too hard for most tracks I race at)