I would highly recommend a 787 cockpit seat instead. Much more comfortable and adjustable than an ejection seat and also kind of futuristic looking from behind.
If you mind the gap between your knees for the controls too much, look for an Airbus seat. They also have nice armrests because the stick is on the side.
A friend of mine is a chief pilot for an (astonishingly) wealthy family. One day he toured me through their 2-year-old Bombardier Global Express jet. I asked how much one of the somewhat flimsy-looking passenger-cabin seats cost and he said, "About $40,000."
He pointed out that virtually every single element in the $60+ million aircraft is engineered for flight and occupant safety, and to be as light as possible.
I have a couple of seats I pulled from a VW GTI that seemed very comfortable when they were in the car, but when I've sat in them outside of the car I feel like I need to be going faster. I imagine an ejector seat might have a similar effect in the absence of the G-forces it was designed to handle.
If you mind the gap between your knees for the controls too much, look for an Airbus seat. They also have nice armrests because the stick is on the side.