The Harbaugh staff is complete! Without a question, this is the most NFL heavy staff in the entire country. It just has to be. Will pay huge dividends on the recruiting trail, since kids have NFL aspirations.
(brief track record in parenthesis)

HC: Jim Harbaugh
OC: Tim Drevno (Harbaugh's OL coach at Stanford, also his OL coach at San Francisco)
DC: DJ Durkin (Florida's DC under Will Muschamp)

QB: Jim Harbaugh
RB: Tyrone Wheatley (Buf Bills RB coach, legendary Michigan RB)
WR: Jedd Fisch (Jax Jaguars OC) (Yes, we really got an NFL OC to come be a position coach for us)
TE: Jay Harbaugh (Jim's son. No track record really, but he's a Harbaugh, and people with the name "Harbaugh" have a knack for coaching lol.) (Nepotism ftw)
OL: Tim Drevno (on top of being OC, Drevno will double as OL coach)

DL: Greg Mattison (Brady Hoke's DC)
LB: DJ Durkin (on top of being DC, Durkin will double as LB coach)
CB: Greg Jackson (SF 49ers DB coach)
S: Mike Zordich (Phi Eagles S coach from 2011-2012, Youngstown St DB coach from 2013-2014)

This is definitely a top 3 staff in the entire country. No doubt about it.