A lot of people have done the booga in wool of the andes (knitpicks) or at least the bottom of the booga in it. You can really do it in any feltable worsted weight wool.
The benefit to the noro kureyon
is that it is self striping and has beautiful colorways. I did a lot of comparison before pricing and I'm pretty sure I have it for the best price around. You can get it at almost any online yarn store though.