I'm loathed to go overboard about any of the candidates, but in simple terms it seems to me we're looking at something along these lines:
A DoF who has some pedigree, preferably within an attack minded set up, experience of working with younger players coming through the ranks and also picking out up and coming talents from elsewhere. A real focus on developing talent and addressing the areas where we fall short - in the attacking areas and more importantly, as an attacking unit. The main point though will be to attract quality to the club.
Steve Clarke - While I agree with Rosco that our defense isn't what it was and we do still need to improve, he is a good defensive coach who will work on the spine of the side and the back four, adding balance to what we're trying to do elsewhere.
The Manager - A young(ish) up and coming talent with attack minded leanings, capable of playing good football and working within restrictions if needs be, while getting the best from what he has available. Whether Martinez is that man remains to be seen, he's certainly not without talent, but he's also shy of the experience at the top level. And despite what his Wigan side did against the big sides last season, they also lost alot of games. His games won ratio is more than worrying. But sometimes making the step up and working with better players sees a marked improvement, the demands at Liverpool are different to those at the likes of Wigan though, as we found out with Hodge.