I never was one for large letters on a house. I call it "TACKY"!
Letters understated would apeal to me!
What I have always envisioned is A Copy of The Badge Hanging from the House which would be lighted. Smaller letters maybe on a Brass Plaque beside or above the door.
If I am proud enough to wear My Badge, why not Have The House Wear The Badge? That is where we as Greeks Live.
Just my small take!