Scar is good with everything... you can't go wrong with any module. The feline is a light weapon. Use that as an advantage. Mobility enhance and weapon pro are pretty good with it. Rapid fire is a beast but you have to aim good and conserve yer ammo.
Pretty much what War_Spirit said. I also use Mobility+Stealth Enhance(if they gonna cloak, so will I ) and then choose whatever for my Armor modules, which, for me is Air Stomp atm.