Bearing replacement advice for PM-25MV mill (spindle and pulley shaft)

I'm about to replace the bearings in my PM-25MV style mill. I've got a 1.8kW AC servo motor on the spindle that runs up to 4500 rpm.

Two questions:

For the bearings on the pulley shaft (the intermediate shaft that drives the spindle belt), should I go with C3 clearance or standard clearance?

What tapered roller bearings would you recommend for the spindle itself? 

Any advice from people who've already done this would be great. Thanks!