I love my ShopSabre, but I'm an advanced hobbyist so justifying an ATC after opting for other goodies like a vacuum table wasn't in the cards. Having said that, I felt I was making a serious investment so I bought something made in the US to ensure I have long term support. ShopSabre and CAMaster use WinCNC controllers. WinCNC is a 3rd party CNC controller company that is widely supported (Vectric/Autodesk/Enroute/Optiscout/etc.), robust and, again, local. I looked long and hard before making a serious investment and it came down to the two aforementioned manufacturers for me. They weren't the least expensive, but I feel, for me, they were the two best choices.

There is also Phantom CNC, which have what look like great machines at a lesser price and a few compromises (IMHO), but they may fit your needs as well.