The router/spindle question was pretty thoroughly explored in:
I indulged myself in a Mafell spindle, mostly for the tool change, somewhat for the cool factor — I do a lot of test cuts and some days it felt as if I spent more time wrenching on the collets than the machine spent cutting.
Probably you’d do well starting w/ the ER-11 Carbide Compact Router:
then if you find the need to further decrease cutting times/increase material removal rates you could move over to the HDM spindle on an HDZ once it’s available.