If you have had success with the booter then maybe just get the newest pair.
I have the '12 booters and love them. I don't really plan on upgrading other than getting a stiffer tongue. The wide toe box/foot bed is so comfortable.
If you like the fit of your boots then you might like First Chairs as they have a wider toe box.
However, like with all the boot threads. The best thing to do is go to a fitter.