That drive pulley is crazy on that spindle, the 2 sheave is ok but the 4 is crazy, you don't want a pulley like that to drive a 30 Taper spindle, the important thing with these spindles is that they have 2 angular contact Bearings in the front / nose of the spindle some of these only have a regular Deep Grove Ball Bearing and you don't want that, the best belt system is a Poly-V-Belt.
That may be the price per collet
On the tool holders get the shortest holder which I think it is 70mm I will look for shorter this will help if you don't have a lot of Z travel