Another vote for R8, there are quick change tool options for R8 and collet systems. As Bill said your intended use is a factor. If I was planning to use the mill for production, making multiples of something and it would require frequent tool changes which would require me to raise the head, change tool, lower, touch off to set the tool height, a bunch of that repeatedly I'd want the power up/down feed on the Z axis head plus quick change tooling or a power drawbar. I would also want a DRO probably on both the head and quill.
If you just plan on mostly doing manual mill one off type stuff for fun, if you are in no big hurry e.g. machining is a relaxing hobby then you can dial back the options. I'd still want a power up/down feed for the head and a DRO. DRO's are awesome, I have them on both my lathe and my mill. Being able to hold .0002 on a machine in this price range is pretty cool. X axis power feed would be mandatory for me. I have 26 inches of X travel and that is a whole lot of cranking on a hand wheel.
I have the same mill as Bill, I too have the 3ph motor and VFD and consider it well worth the money. Bill converted his to belt drive I still have the gear drive. Bill's belt drive is a lot quieter and I think his top spindle speed is 5,300 rpm. My geared head is LOUD and I max out about 3,200 rpm. Bill do you actually run yours at 5,300 rpm mine is a bit scary at 3,200.