Sooooo I disagree with almost everyone in this thread- I dont think NBA head coaches are particularly important.
Unless you have a great head coach like Popovich or Phil, it just doesnt make a difference. This is the reason NBA coaches move around so much- players get tired of a guys style or the team wants to look like they are doing something, so you fire the coach and hire another guy without losing much of anything
As long as the team hires someone mostly competent I'll be happy.
I would put Thibs up there in that category as well.
Ideally, I would like a hard-nosed, gritty coach in the Thibs/Popovich mold that the players trust and respect.