I'll second Newtones - very good strings.

On my Regal, I've previously used 13s of other strings. I've just restrung with Newtones 12s (just because I had them) and they seem a bit too light, so for me, 13s seem to be the best for resonator. I did try some Thomastiks on it once and they sounded awesome, but they're too expensive to use regularly.

Graham.