4. Variable Frequency Drive - the top of the line solution, provides
electronic variable speed control. I would assume the top price. I


You can buy NEW VFDs for reasonable prices.
For example dealers electric sells a Teco 2HP for $246.
Price is dependent on size.
www.dealerselectric.com

I have a Teco 1HP on my surface grinder and 2HP on my lathe.
I have a Boston Fincor on my mill. VFDs are the way to go.
chuck