The GSW alternator at 580 watts (is that correct?) supplies a whopping 20 watts less than my '05 which was rated at 600 watts. My '05 had power assist "whizzy" brakes that sucked up the juice. There was still plenty of power left over for halogen fog lights, heated gear, etc.
I did not order LED lighting. It's not that important to me. I'll be moving the same halogen fog lights to the new bike. I expect to still have plenty of power left over for heated gear. More than I had with my '05.