I'm also a Sci in a Luna

Love the little guy.
Just to give you ideas, I currently run a power drain based build myself.
Fore: 2x Polaron Cannon Mk XII [Acc]x2 [Dmg], Photon Torpedo Launcher Mk XI [Acc][CrtH]x2
Aft: 3x Polaron Turret Mk X [Acc]x3
Mk XII Omega Set
Devices: Weapons Battery, Auxiliary Battery, Deuterium Surplus
Eng Consoles: EPS Flow Regulator Mk XII (Green), Nadeon Detonator
Sci Consoles: 2x Particle Generator Mk XII (Blue), 2x Field Generator Mk XI (Blue)
Tac Consoles: 3x Polaron Phase Modulator Mk XII (Green)
Tac BOff: 2x Tactical Team I, Cannon Rapid Fire I
Eng BOff: Emergency Power to Shields I & II
Sci BOff: 2x Hazard Emitters I, 2x Energy Siphon I, 2x Feedback Pulse II, Photonic Shockwave III
Space Active Duty:
Hazard Systems Officer (Purple)
2x Shield Distribution Officer (Purple)
Warp Core Engineer (Purple)
Photonic Studies Scientist (Purple)
I can list the skills for you if you want, but I think I have them listed in another thread.
Yes, I lose out on the innate Target Subsystems, but I won't miss them as I barely used them, even Target Shields and Engines. Cannons and turrets fire more often than beams do, so you get more chances to proc the power drain, especially with CRF, and Tetryon Glider from the Omega drains their shields just as fast as those Polarized Tetryon Beams, if not faster due to damage + RoF. Siphons are nice too. FBPII can do some nasty damage too, especially if you get swarmed or find yourself in an otherwise sticky spot. PSWIII I've done upwards of 30k with, plus a 3 sec disable with a 36 sec cooldown. The WCE DOff would be nicer if I could have multiples, but he works nicely with EPtS spamming. And... uhh... Yeah. Wish I could reduce the cooldown on Brace for Impact.
I used to run Tachyon Beam III in multiple copies. Now... I think it's such a useless ability. It just doesn't do enough. The only Sci ability I used to use that I miss is Gravity Well, honestly.
U.S.S. Ultima, NCC-100101-X, Fleet Recon Science Vessel
U.S.S. Demi, NCC-100101-Z, Peregrine Fighter
U.S.S. Spaceball 1, NCC-123456, Tuffli Class Freighter