Where I play regularly is using a comp matrix now to figure out the majority of the comp score. Personally, since I keep on getting boned on comp regardless of what I do, I've decided to make the most powerful list I can.
1st list (23/25 comp)
Master (PW/SB, Terminator armor. 
4 Termies (2 AC)
Epistolary (FW/SB, Terminator armor, Fury, fear)
4 Termies (2 AC)
6 man las/plas in Razorback (Twin heavy bolter)
6 man las/plas in Razorback (Twin Lascannon)
6 man las/plas
6 man Plasma cannon Tac squad
Land speeder squadron (2 Tornados)
Whirlwind
Pred (AC/2 HB)
8 man Dev Squad (4 ML)
2nd List (22/25 comp)
Master (LC/SB, Terminator armor)
4 Termies (2 AC, 1 CF)
Epistolary (FW/SB, Terminator armor, Fear, Fury, Furious charge)
4 Termies (2 AC, 1 CF)
6 man Las/plas squad
Razorback (Twin HB)
2x6 man Las/Plas squads
6 man Plasma cannon squad
5 man assault squad (vet w/power fist)
Land speeder squad (2 Tornados)
8 Man Devestator squad (4 ML)
Pred (AC/2 HB)
Which one do you think is more powerful? Note, that it'll be the weird missions that used to be in GT's and the second list should earn 1 less comp point, but since I keep on getting tanked on sports/comp there's no real incentive not to take the more powerful of the lists.