Speaking of dust, let me tell you about my studio. IT IS DUSTY !!!
Sorry to shout it, but I want you to know that a marble sculpting workshop is not very glamorous. The dust is everywhere, and can be very destructive to any kind of electric tool. I've had very good luck with the RTX. I try to keep the dust away from my tools with an exhaust fan, but it is near impossible.
Also, this is a reasonably priced tool. It doesn't take much money to get started creating your kind of art.