RE: billy goats
From everything I have read, BC would probably be your best bet. Wyoming, Montana, Idaho, and Nevada all have goats. I think Colorado and Washington do to, but not sure. You can hunt all but Wyoming without a guide, but odds of drawing are steep, as are the prices of the tags. Nevada will run you $1400 with tag and license. Wyoming is $1800. Not sure about Idaho, Montana, or the others. It all comes down to how you want to hunt, and how long you want to wait. I would go for BC, and keep applying for all the states I can until I draw. I think all of them are once in a lifetime, and I am sure it would be worth it!! Here in Nevada the success rates are typically over 80% every year, and a lot of years 100%.