for me I wouldnt re-use the wheel bearings on a sports bike and I would buy them from a bearing stockist not a m/c shop. I tell them what the application is and the bearing ref which is usually etched in the outer race face.
I get mine from http://www.ashleypower.co.uk/
but thats only because we use them at work and they deliver to the office.
Yesterday at the dirt bike show at Stoneleigh Park I saw a company specialising in sprucing up wheels http://www.central-wheel.co.uk/
I know they are only going to exhibit their best products but they looked fantastic.