I find it hard to decide between Mob/HnH. I wouldn't class Turn up the Night as anything similar to Neon Knights and both have their merits, but I think I side with Turn'.
Lonely is the Word is one I often find overlooked but thoroughly enjoy, and Die Young as well (particularly live versions help to sway this).
As for Dio's best? I don't find Magica that amazing on the whole but it has my favourite Dio track... but Holy Diver just can't be left out. Honestly I find DYK an awesome album, and whilst I do enjoy the Rainbow material I find it very inconsistent/varied on the albums, with some amazing tracks and some not so, same as most of the Dio albums. With DYK, it had had quite a long time for riff's/melodies to be dreamt up by the guys which I think helped to give it a more consistent solid feel. Bible Black is one of my favourite Dio tunes.