Six. I'll admit my XLT doesn't see enough action anymore but with the 6 Eliminator & Bigfoot coils there are special applications I keep it for.
Now the list: V3i, XLT w/Sunray, PI Pro, Sovereign GT, Fisher CZ20 10, Coinmaster Pro. PP's on hand - Detector Pro Pistol Probe (DEEP!), Garrett Pro Pointer, Vibra 460, classic target probe, DX-1. There is an assortment of break down rods for travel. 5 coils for the Sov GT, 4 for the V3i, 3 for the XLT and the rst just have the stock coils. Guess I like to be prepared. The other side of it is I always have a spare something if a friend has an equipment malfunction. Ok, I'm an addicted MD'er!