I was looking at an AC servo for £260 odd + driver on Zapp Automation.
I hear what you're saying Re the 4-flutes. I bought a 3-flute long rougher too which is supposed to be good for ally but I haven't used it in anger yet. I might order some long 2-flutes as well - but TBH I don't have any galling or flute jamming issues with my roughers - I suspect the lower stock rpm also helps there.
I have a 3" deep pocket to cut, and on this mill, I don't really think I want to use anything fatter than 12-16mm, so I'm suffering from tool deflection issues.