Having watched him the past few years on NFL Network, Mayock might be my favourite draft guru out there. His analyses always seem solid and well-formed, and he isn't afraid to go against the grain. Here's his top 5 for every position, with a few surprises:
Mike Mayock's draft prospect rankings (updated Feb. 6)
To name a few obvious surprises: Mendenhall over McFadden at RB, Henne over everyone but Ryan at QB, and Ellis over Dorsey at DT (which isn't as surprising as the others).
(If someone knows how to paste the thing here so people don't have to follow the link, do it.)