The last time we looked at this, the trim routers were the best value and worked well for most needs:
That said, I did get a Mafell FM 1000 WS for my SO3 XL:
but my justification there was I was doing so many test cuts for tech support that some days it felt as if I was spending more time wrenching than cutting.
That said, Carbide 3D will have a spindle upgrade in the near future (see the description of the HDM for what we think of spindles), so check in w/ sales to see if there’s an official recommendation.