I know 39mm are cheaper. And for the Milanos, I'd rather have either 39 or 46. The 43 is so similar to the 39, meh (not worth the hassle IMHO), that I'd rather have it bigger or the same. My preference would be the 46, because they're boss!!! However, for this being a traveling set for me, the 39's make more sense (and they're a lot cheaper). However, it makes no sense to have Steve do up two different artworks. I'll just do what the group decides, if that's 46, 43, 39, I'm game for 41 of them.
As for edge. These could potentially be in people's stacks, I'd think they need to be bold and distinctive to stand out as the BOUNTY. Gold is cool, and Milano or Bounty (in a different colored edge spot) text on the rolling edge is a plus. It needs to stand out. That gold chip, with gold rolling edge, with 3 black spots (with "Bounty" written in gold in the spots) would be the nutz!