I think I might sell my xcans, instead of modding it. PinkFloyd made a good point - it needs a PSU upgrade, decent caps and the valves swapping fairly regularly. Soon turns into an expensive amp - I've already done the valves once, and it sounds great, but the new valves are starting to hum slightly!! (OK, so theyre 5 months old..)
Mint next sounds pretty good. Wouldn't mind having a decent circuit board for the next one though. Just makes it that much easier!