I have no knowledge of Intelitek, but Personally if this is a servo based machine and has a quality motion card, I would tend to stay with this, if they still support their product.
Mach and steppers would be a solution, but in the end you would be close to the same budget and a lower quality system and a longer time line to get back in operation.
Motion cards in general are closer to commercial CNC systems, and in some cases are on par.
Al.