You want the 1K7 hub then: Pre-78 legal, common as mud, light, strong and with a good brake.
You're basically spot on with the brake side of things too - although a train-spotter could point out the different SLS, angled lug brakes from stuff like monoshock DT175s and early XT250s.
I've got heaps of hubs, but no wheels that are worth using. If you're happy with just a hub, then make me an offer - cheaper by the dozen! (I exaggerate, but you get the point - cheap!).