I have Torpedo: High Yield 1, but anything you like would go here.
Engineering Team 1
Emergency Power to Shields 2
Tractor Beam 1 (The Defiant had a Tractor Beam)
Hazard Emitters 2 or Science Team 2
Cloaking Device and an Ablative Armor console are a must. You may want to try some Phaser Relay consoles as well as the Zero Point Quantum Chamber. You might also want to put a Biofunction Monitor and Emergency Forcefields console on it, as well.