Out of those three I would choose the copper john.

Spott Hog makes good sights but I don't like how they have their pins angled.

Another one you should seriously consider is the Dusk Devil from Montana Black Gold. The straight away pins are really bright and they instantly tell you if you are torquing your bow in the slightest. The entire sight, including the pins, is covered by a lifetime warranty. I bought this one a few months ago and really like it.

As for pin size I personally like .019" pins. I can be more precise at longer distances and I still get plenty of brightness from the straight pins.