Personally, I normally go for staff who are free agents..no paying fee's to clubs and wasting money, Also like to keep my wages nice and low as i can, But still employing high level staff. I'll put down a few i always go for (English prem/Championship is where i play most):
Assistant Managers:
Jair Ventura - (Botafogo) Not a Free agent but for me and most people who know of him, a MUST buy assistant..Great stats..great low wages, Will join many clubs..He's 41..plenty of years for him to get much higher stats.
Tony Coton - (Free Agent) Said above, but just wanted to add, tho low tactical knowledge, rest of his stats are fantastic (including 5 star GK training) Always can be knocked down in wages to under 1k.
Physios:
Pete Friar - (free agent) Must be in top 5 best physios in FM12, Nice low wage.
Nick Worth - (Free agent) Like above..must be in top 5 best, around same wages, young + more stats rise.
Scouts:
Steve Nickson - (Free Agent) A must buy..very cheap wages..in many of my games rises to 20/20 in ability/pot.
Ayres Albuquerque - (Free Agent) For Premiership clubs, Super cheap brazilian scout (sometimes even £400 a week..) another must buy to find those brazilian kids.
Steve Martin (free agent) Another nice cheap english scout.
Paul Montgomery (free agent) Same as above.
Fitness Coaches:
Paul Winsper - (Free agent) 5 star STR/Aerobic, Cheap wages.
Adrian Lamb - (Free agent) 5 star/4.5star STR/Aerobic (depends on load) Very cheap wages.
Other Coaches:
Mark Chamberlain - (Free agent) Tactic/Ball Control (change to coach not youth)
Jos van Dijk - (Free agent) - Ball Control/Shooting (Need Holland db)
John Murtough - (Free agent) Same as above incase dont have Holland added.
Steve Walford - (Free agent) Defending.
Andrew Cole - (Free Agent) Attacking.
Tosh Farrell - (Free agent) Shooting (Change to coach not youth)
I know these might be a little of topic "Best staff in game" but for me personally like i said above, these are all cheap..high level staff with stats not far from the best in game..i'd prefer these to paying 5k upto 10k a week per staff member. Hope these helped anyone. (H)