Also is the disarming bash perk worth getting in block? How often does it disarm an opponent?
Probably ebony or daedric looks best as it the correct color.
Nope you wouldn't lose armour bonus.
Or at least not to any major degree (especially with something as high-tier as Ebony)
The "custom fit" and "matching set" perks are only affected by your worn armour type - your overall armour rating (including ANY shield) will still get the bonus from these perks as long as you're dressed head-to-toe in light armour.
The only difference will be that if your heavy armour skill is low, the armour rating for the shield *might* be (relative to your light armour skill) lower than light armour shields.
e.g. if you have Heavy Armour skill of 15, and the Ebony shield gives you an armour rating of 20, then whilst wearing a full set of light armour, the +50% would be +30 from the shield overall.
Whereas if you have a Light Armour skill of 100, and a Hide shield gives you and armour rating of 40, then you'd have +60 armour from the shield.
I'd suggest checking what light armour shields look good, and then compare the AR with Ebony.
I doubt the difference will equal more than a few % in damage resistance.
-HK
Dawnguaurd rune Shield? It is light armour, pretty strong and the colour looks okay with Nightingale armour.
Correction:
Shield with Batman suit? I do believe you're doing it wrong XD
Batman does not use power armor as his main suit, he uses a friggin regular suit more like the Nightingale armor.
NIGHTINGALE IS ZE BATSUIT!
Well for me, I use Shield of Ysgramor with Nightingale armor set.
This, the mysterious patterned designed and dark bluish colour scheme is perfect.
Nordic or Ebony both go well with it I think.