The Openbuilds machines are the closest thing to a "standard" in low-cost CNC routers. They are a kit, but they're well-designed and have good support.

If you want a CNC router that truly "just works", you're looking at spending five figures on something that's delivered by a semi truck. You can't escape the laws of physics, so a reliable and stable machine necessarily requires a big steel or cast iron frame.

https://openbuildspartstore.com/machine-Kits/

https://lagunatools.com/cnc/swift-series/