I've been through most of these. Would recommend a slow speed grinder with Camel Red wheels for the low cost, and Oneway blue wheels for medium cost. Tried a couple lower cost Nortons but they were horrible in wear (not the SGs or 3X). Not that much difference really, but to some, maybe big in the wheel cost. You can use a 120 or greater anywhere you use an 80 grit, just takes more time if you are changing the angle and more cost because you are using more of the wheel. Bought a Tormek years ago (or any other wet grinder) and determined I can make the same angles on it just takes longer and on a high grit wheel, takes more of the wheel. If you have a bunch of gouges and only sharpen as a matter of reloading the quiver of gouges, probably doesn't matter because it is only non-turning time involved. If you only have a few gouges and you are sharpening between turning, the opposite is true. With harder steels (M3/4 V10/15) it gets worse because of the hardness. What a CBN wheel really does is allow you to reshape with less issues of the wheel wear and wheel dust. Both are issues for different reasons and you need to weight the cost of the results for your individual results. Eventually, i with a slow speed grinder and CBN wheels and the Tormek sits in the corner waiting for me to do something with it.