Here's my current ship configuration.
Right now, I'm using the Borg set with a MACO Shield Mk XII. I was wondering, would it be better if I replaced the Borg set with a complete set of MACO Mk XII?
Looks like a solid build.
Only thing I'd suggest changing are the devices, since deployable turrets get destroyed far too easily. I'd second Timelords advice (if you intend to PvP though, I'd replace the fighters with a shields battery for when your shields get disabled.)
The complete MACO set isn't really worth it. MACO shield + Borg set is the best set up.