Okay. I've gone here before but you must have missed it. Simply put, you CAN'T afford any wheel except a CBN wheel. Think it through. You buy cheap, you get cheap. Norton white wheels are great. Except, You have to true them up and keep them that way. Every time you touch a piece of metal to one, you loose a little. They work good as long as you keep adjusting them, moving your guides in, and in, and in. Pretty soon, you buy a new one. How long does it take to wear one out?
A CBN wheel NEVER needs to be trued up. You buy one, ONE TIME, and someone in your family gets to inherit it, because you don't wear them down. Set your jigs in place ONE TIME. The wheels stay the same size forever.
So, the choice is simple. Buy less expensive and replace them over and over plus the anxiety of having to adjust them through their useful life time. OR, get the CBN, set things up once and always have a great wheel ready for you when ever you need it.
Pretty simple choice.