The 2.2kw chinese water cooled spindles have really opened up the quiet spindle accessability to the hobby market though and teh 3.0kw spindles are only marginally more. You are looking at a $200 VFD and a $400 (or less) spindle and a small water pump and a circuit in your controller to start the VFD (very easy and cheap if you built your own controller). A set of precise collets will run you about $100 for ER20 and that will give you 1/8 to 1/2 bit mounting capability. The 2.2 mounting requires a 80mm mount and K2CNC makes those available for $65. 3.0kw is 100mm. While a 7518 can be had new from $249-$300 I am still thinking I would like to try one of the spindles out.