I have the owl at 5 inches wide and about 5 inches tall. I have a one printed out and it lookes pretty good at that size. I could probably go as small as 4 inches square if you wanted but i start to lose some of the detail.
Also I don't think that I will be able to package the art with the lettering on one sticker backing-would it be ok with you all if i just sent the lettering and the art as two different pieces? Then you could line it up when you apply it. Like I said this is done in my spare time and in order to get it right it would take me about 10 min per sticker to cut,weed,and transfer to a second vinyl. If you do want them on one backing it would just take a little longer to get them out to you. The price would be 5.00 shipped to your door, maybe less if we went smaller.
Also like I said before I could do up some hondaswap.com sticker for B if he wanted I noticed that he is out of them. Brian pm me if you are interested I am sure that I could do it cheaper than anyone you have local.