Thanks for all the replies. The experiences are similar to mine. My 2 Valkyries and 2 F6Bs with about 350,000 combined miles have been very reliable. The only surprise was the audio amp. I looked that up and it's not cheap! That's the first I've heard of that one so it must be a truly random failure and not a flawed design.

I still have a week to decide and may end up flipping a coin!