I'm a fan of Allen Mogridge at FIU. Butch had him as a young TE/ST coach at UNC and brought him back when he was hired at FIU. The guy has been an OL coach at Buffalo, one year at UCF, and now two years at FIU (still only around 40 years old). He's a good up and coming OL coach (also learned multiple positions so he's very versatile) and has been recruiting in Florida for a while now as well.
Another guy that could be interesting is the assistant OL coach for the Dolphins in Chris Kuper. He's very young and played like 7 years in the league with now 3 years of NFL experience. One of those was only a offense quality control guy, but this year and last year he's been their assistant OL coach.