California likes to bend you over, no grease even as a courtesy, and take your money for fees to help support our dysfunctional state government. Gee, I hope that wasn't blunt. If you can, buy in NV to avoid the extra fees and taxes. You'll also have an address there to associate the registration to...that is important. You should be able to sell the bike in any state when you leave. I don't think there's any such thing as CA emissions on bikes but, I could be mistaken. In CA, the dealer will provide you with temporary registration that you will carry on the bike. I assume NV is the same.