Mike, thanks for the info on strings. I did read the info sheet (amazingly for a second-hand guitar, it still had that tucked away in the case!) but I didn't see that note about string gauge.

I've never been greatly impressed by D'Addarios either, but they're a very neutral string so I've found them to be a good starting point. I'll see if I can find those Gibsons.

Graha.