I played the 4-4-2, A-1 formation, the one with a deep DMF, 2 SMF's pushed up the flanks and an AMF sitting behind the front 2.
I have continued using this formation to this day up to 2010 when I have 134 WEFA ranking points and am 45 points ahead of the next best team! So it has served me well!
I make some slight adjustments to the formation, using the 'attack arrows'. The Side Backs have arrows pointing out to the flanks and back towards their goal-line to keep them back during some attacks and also keeping them out wide to help counter-act wingers. When facing wingers I assign the Side Backs to aggressive man-marking duties.
Then the SMF's get 1 diagonal arrow pointing towards the corner flags in front of them (towards both flanks and opponent's goal-line). This gets them making more runs forwards and helps keep them wide.