I expect that eventually the Cardassians will be a faction we can gain reputation with, so I would like to propose the following 3 piece space set for that faction as a reward:
Cardassian Positron Deflector Array
This Positron deflector has been modified to not only enhance the rugged durability of traditional Cardassian warships, but it also improves the output of several key auxiliary systems.
(the idea is that it has bonuses to hull and shield hitpoints like a positron array, but also has a good bonus to subspace decompiler and particle generators to buff science abilities.)
Cardassian Hyper-Impulse Engine
This miracle of Cardassian Engineering allows the ship to accelerate much faster at impulse speeds than most other craft of its size. At first glance it is easy to under-estimate the speed at which a Cardassian Cruiser can move and it is nearly always the last mistake that its enemy will make.
+24 Starship Impulse Thrusters
+15 Flight Speed
(Efficient at high power levels)
+2.5 Engine Power
+7.5 additional Engine Power
(bonus increases at low engine power)
+4.8 Flight Turn Rate
All Power to Engines
+101 Flight Speed
Diverts all power to engines
(the idea is that this engine is FAST. It should be much faster than any other engine in combat with a bonus to Starship Impulse Engines, a high base speed, and being efficient at high engine power)
Cardassian Regenerative Shield Array
The Cardassian union simply never developed shield technology equivalent to the Federation. While this shield possesses relatively low shield strength, it has been optimized to regenerate quickly and resist torpedo fire. Additionally, a focus on reinforcing the ship's structural integrity field allows the hull to withstand additional impact.
+24 Structural Integrity
~5000 Maximum Shield Capacity (With a 1.0 shield modifier)
~250 Shield Regeneration every 6 seconds (at 50 shield power)
Reduces Kinetic damage to shields by 20%
(the idea is that this shield can thwart a finishing torpedo salvo by regenerating enough additional shield points at the last second to withstand the impact. Cardassian shields could never withstand Federation energy weapons very well according to canon)
2 Piece Set Bonus: Genetic Resequencing Medical Bay
Cardassians are well known for their genetic engineering, and their ships boast impressive medical bays capable of rapidly growing entire limbs and cloned organs. This allows starship crew to heal much faster than normal.
+200% Crew regeneration rate (dead and disabled crewmen recover three times as fast as normal)
3 Piece Set Bonus: Plans Within Plans
The Cardassian Military is notorious for laying overly-complicated traps involving holo projections and sensor ghosts. When their enemy is sufficiently confused, they strike with overwhelming ruthlessness. By employing these dastardly tactics you believe you can briefly gain the upper hand in a conflict.
Affects Self and Foe
3 minute recharge
-20 weapon power setting
-20 shield power setting
-20 engine power setting
Creates a photonic displacement of your ship for up to 15 seconds
Creates 5 cloaked level X photon mines (not affected by BO abilities)
* I was also thinking a 4 piece set bonus might be in order, if you use it on a galor cruiser. It could give a bonus hull repair and damage for spiral wave disruptors. Maybe something like this:
Shades of Obsidian (or something cooler, I'm not good at naming things...)
+15.2 Starship Hull Repair
+7.6% Spiral Wave Disruptor Damage
So what do you think? Personally I favor the deflector, and I would use it on my science ship in a heartbeat. But the set overall favors cruisers, as a Cardassian themed set should, I think.
*EDIT: I added a turn rate bonus to the engine. I also added a bleedthrough percentage on the shield.