I want someone like Harbaugh. A very good offensive mind who can be hands on with a young QB, is energetic and values a dominant defense.
I really don't care what side of the ball they come from, but conservatism here has run it's course. I want someone who wants to dominate on both sides of the ball and knows where his strength lies.
that's why i like kelly so much.
the problem that has been with kelly's defense and probably my biggest and only concern about the tempo of kelly's uptempo philosophy is that it puts a lot of pressure on the defense being on the field a lot. if you score quick then the D is going to be on the field a lot. he tries to compensate bu having more D players than O players so they can be cycled out more and stay a bit fresher, but the benefit is that because they are in his program, they have to keep at the same pace as the offense and their endurance level is always higher than other teams. also if you score a lot, teams are going to be always pushing to keep up on the scoreboard and are usually more aggressive.
the key is to have a good defensive mind with a lot of control over the defense, but who can also keep up with the pace of kelly's program and can deal with aggressive offenses playing from behind or tempo-disrupting ball control offenses that try to keep kelly's offense off the field (which is partly why i think shaw was successful against him).