isolation transformer, MOV's, TRUE ground wiring, and master disconnect switch or breaker close to equipment. When not in use, disconnect. The arcing of a
lightning strike is known to jump through switches.
Isolation transformer: much ballyhoo against the use of this due to "current limitations" but I use a 5kVA trannie. I think this is sufficient for my load. This however should be with a connection to a reliable ground to shunt all the noise as well as surges.
Lightning strikes are essentially DC and will not go through an isolation transformer. This was discussed previously in a topic closely related to surges.
MOV's: this should clamp overvoltages in the kilo-region instantaneously. Again lambasted for the apparent degrading sonic effects. I would use 3 of these, line to line and 1 each for line to ground. If it protects my gear, I would decide to give away 5% of my sound quality if any. I myself have not personally heard a sonic disadvantage to using MOV's. The problem however is you do not know if it's still working. Most of the time though, it blows like a firecracker when subjected to longer term surges or something as powerful as a kilovolt
lightning strike
Industrial grade TVSS: or Transient Voltage Surge Suppressors connected parallel to your circuit. Available with a 45-60 day leadtime. You can connect this at the circuit breaker right after the service entrance of the house. Manufacturers: Liebert, MGE
Cheapest: Unplug
Remember, our computers are prone to
lightning strikes not from the pwerline but from the phone line. Same with TV's from the cable line.
Lightning rods are efficient if you have it in the highest portion of the area but is not a guarantee that your house won't be hit (I saw this one in Discovery Channel). Though you may get hit, you may get hit only once, as
lightning never strikes the same place twice, daw...