Aluminium FEA optimalized CNC router

[PotatoMill]

I thought selecting a stepper or servo should bee easy, but it seems like nothings easy here. So for each person I ask I get a different recommendation. Steppers, open loop, closed loop, no only servos is good enough. The common thing is that everyone recommends servos if I want to use the money. But they are waaaaaaaaaaay more expensive than normal steppers. And all the cheap servos and closed loop steppers is a pain to get information on, since the datasheets and torque curves is not easily available and I have to ask the sellers for it for every motor. But my logic is as follows, if open loop steppers is good enough for Tormach it's good enough for me. First to comment on how this is not a mill. Then I can use some higher quality steppers instead.

By the way can someone remember the good reason to not use overkill steppers like 8nm nema 34? It's not like they are a lot much more expensive. I read it somewhere but I can't find it.