Tang questions

["Umm, fish?"]

I almost posted this in the No Achilles in the 65 thread, but didn't want to take it off topic.

I've never kept a tang because I never thought my 120 was big enough (4' x 2' x 2'). We're now renovating our house and I'm planning a 12' x 2' x 2' tank (with corals), mainly because I wanted to include some tangs in this one. What are limitations as far as stocking goes, in your opinion? I.e., which species should I still leave out?

And, suggestions for what might be a decent show tang? I was thinking Naso, myself. And, for other tangs to go with it (as far as aggression, etc., goes)?

Not ever having had any experience keeping them, I kind of feel like I'm starting over.

So, dreaming about stocking is the fun part. Please, help me out.

Thanks!