Thanks for the input! Now that you mention it I do think the 4th one would look good.
They can't make the embroidery and smaller or it won't come out, so as of right now the collar has to be 2" or nothing. I may end up just doing some conchos and stuff instead.
I do have one more idea that I'm trying to work the details out for that should give me more flexibility in width, but I haven't finalized it yet. Basically I found someone who laser engraves leather materials, so I would get a strap engraved and then have it made into a collar by Ella's Lead, so long as they're willing to do that. Not sure if it will be cost-prohibitive, though, waiting to find out.