prescript: I know I rant a lot, and I wrote loads of useless lines of word (like this), so I am sorry for that, also I added a picture to the beginning, so you can just skip my comments
I have put together a build, which I think is pretty effective for STFs (not for PVP though). I must point out, that this build is customized for me, so if anyone should find it good, they should tweak it, because I know, as this is, it is not the most effective build (for me it is).
note that I do not even want to pretend I know what I am doing on a level that you might find here on the forums, however there are not many sci builds, so I thought I add this to the list, someone might find it useful (maybe someone who knows their stuff maximizes this build's potential).
so I do not advise anyone to copy this, though as I said, this is rather effective. I tested it in PVE, and I barely feel the step back in DPS from my fleet escort (I assume that is because I love using gravity well with exploding ships )
skill wise I have done some crimes against everything (I dunno which is worse, the skills of mine, or the console setup, but I like this the way it is). I know I should not really max out any skill, but I prefer a small step in a skill that I like, over a big step in a skill, that might be useful (bad mentality).
for the devices I really have to press to give it the shield battery and subspace field modulator. I did not put that many healing skills in there, so in a situation where you have loads of enemies coming at you, you might run out of shields pretty fast (I tend to). the third device can be loads of things. deuterium surplus might be a good idea, however you have evasive maneuvers, and ramming speed for quick escapse and movement. weapon battery would be a great thing also, especially if you use the weapons at maximum power, even when it makes no sense at all (you will see). so yeah, use weapon batteries instead of the scorpion fighters, especially if you are a sci captain, who has photonic fleet (yes, I know I qualify for that, but note I said this is a personal build)
Polarize Hull I can be changed to something else, I dont really use it, but comes in handy from time to time, and I didnt find anything useful instead of it (basically I have to use it rarely, but when I have to use it, I really need it).
the other skills are pretty self explanatory
front: dual tetryon beam bank, and two photon torpedos
back: tetryon turrets
tetryon is my choice because of the shield drain, and photon torpedos is a choice because I like the pure dps number, plus I like to face my enemies most of the time (especially since most sci abilities require you to face the enemy, so there is no point in not facing them, especially with the good turnrate the ship has). for the torpedos I have three blue projectile weapon doffs on space duty. with those the quantum torpedos did not feel right, however with purple officers I would say they would work (also there is a possibility for a transphasic torpedo build if and when the 40% penetration hits holodeck). also, I tested with three torps, and the blue doffs are not good enough for that. purple doffs might be good there too. however the beams are important to get subsystem targeting. yes you can put beams in the back, but I like if I dont have to move a lot (even if my ship is built for good turnrate)
consoles (now, you dont want to copy this )
engineering: 3x RCS mk xi
mk xi because it is cheap, and 3x because I like good turnrate. yes, I lose a lot (AFRAKKINGLOT) of defense and healing, but I still prefer the turnrate over these. one or two RCSs should be changed though
yes, I basically put all my special consoles into the sci slots. assimilated module is a must for the borg bonus, plus it has neat stats, and graviton plulse generator is just another crowd control ability. the two that can be left out are the grappler and the theta radiation vents. grappler comes in handy for me (when I mess up with gravity well, and the weaker ship is too far from the others, so the warp core wont hurt them). the theta radiation deals shield damage, which is again good for my torpedos. as the grappler substitutes for tractor beam, this substitutes venting warp plasma
tactical: 2x tetryon pulse generator
it would be logical to use some photon dmg boost, but getting the shields is important, and I have the beams there for that. if and when I get the omega set, I will ditch at least one of these for the photon detonation assembly
as for sets I use the borg with a MACO mk XII shield. however I do not want to use that. sadly I do not have the mk xii omega engine (or mk xi for that matter). I would say for this setup the best option would be the two pieces of borg (deflector and console) and the omega shields and engines (shield drain is really useful).