Matadem, thx for ringing in... seems u have been in my shoes not long ago ;)
Several questions for you, as u have direct experience with where I am heading...

First, I spoke direct to Vectrix tech support, they can not cut Helix.... only 2.5D, i.e. wrap around 2d cuts. They researched it hard before confirming, so I assume they got it right... It appears a more capable CAM is required...

I was considering an AVID, love the flexibility. Then I watched a you tube video of a guy who owns Avid then an Phantom, and he showed how flexy the avid frame was, which is why he could not get the repeatability he desired.... which was acheived on his phantom...or any solid welded base machine. I plan to do very fine work, joinery, etc, where accuracy is mandatory. Hence why I was swayed away from AVid. I am curious of your thoughts on this? They reviewer was not trashing Avid, as he still owns one.... but it did make me feel as if rigidity should be a priority?
https://www.youtube.com/watch?v=OjruXNz_9hk&t=465s

Although, re checked the avid web site and the desk top unit appears to be sturdy option, as it has no legs...hmmmm....

The other issue with Avid was no ATC supported by the company... although a 3rd party unit is available, but fear the support issue...

any input would be helpful...