I use 1/32. This is also real convient because you can buy Holly in 1/32 sheets. Also in the FWW 180 Steve Latta lists his source for 1/32 dremel bits.
I took the card table class with Steve at the Old mill, If I can be of any help let me know. I read the FWW article and they glossed over alot. You can also try emailing Steve he is very helpful, but sometime hard to get ahold of.
-Tim