That's kinda like asking "What's the best motor vehicle for $5000?". Do you need a car? Truck? Motorcycle? RV? Boat? Does it need to haul cargo, or people?
What kinds of things do you expect to make? How big are they? What metals will they be made from? Aluminum, steel, stainless, titanium are all have very different requirements. Do you need coolant? What size tools do you need to use? Smaller tools require much higher spindle speed. Larger tools require much more spindle torque. What total work envelope do you require, taking into account vises, clamps, fixtures,, etc. What kind of accuracy do you require? What's more important - accuracy or speed? Does that $5000 include all the necessary tooling, which typically costs nearly as much as the machine itself, sometimes more? All these things and many, many more have to be factored into deciding what the "best" machine is for any particular application.
Regards,
Ray L.