I haven't needed to change brake pads yet, but on the dirtbikes, I'd just get OEM's. Never looked to see if they were sintered or not.
I don't think the Vulcan OEM ones are sintered though. Sintered pads are made more for consistant braking during extreme braking conditions and high heat, such as racing, from what I understand. That's why they'll wear a non-sintered type rotor faster, because the pads are harder.
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC
"When life throws you curves,
Aim for the apex."