Geez Mike, once again you've done a helluva job here! Congrats!
With regards to your above thoughts - no matter what you do some one is going to be mad...
I also had to make a hard choice between BN or N, finally deciding to go with BN. I do want a nickel one, but isn't that what trading is all about? This way the buyer can choose which one of the set to trade. I see alot of extra work in allowing buyers to change orders now.
Also, you could offer more colors in any combination and people would most certainly buy 'em all up (me included!)
But, it looks like I'm just repeating what others are saying.