Thinking about switching over to a spindle

My router ranges from 10k - 26kish. 10K seems too fast for 1/4" bits and I go through quite a bit of them.

Should I go with a spindle setup? Would this 500 watt work or do I need to 800 watt?

Will gcode spindle speed control work with the original mega and shield? Looks like it will work with Eastbay’s board.

Or should I find a router that will work with a speed controller? Mine won’t work because it’s a soft start. Will I be able to get the router down to 4K range with the controller?