Lefty, If you want to use koa, I hope you'll check out our website, curlykoa.com. If you buy a set from us, you'll know you are getting properly quartersawn and air dried wood, and you can see the bookmatch pattern of each set for sale. Most of our sets are highly figured, but we do have some select grade. There is one offering that one picture is used to describe multiple sets because they are so similar. About $30 if I remember correctly, plus shipping of about $8. My first uke was of select koa and it is a beautiful intrument.
Speaking of mahogany I recently bent my first sides out of African mahogany and I really had trouble with them cracking on the upper bout bend. It's the first time I've ued kiln dried wood and I'm wondering if it' a characteritic of the wood or the drying process. What have you experienced with mahogany?