I have an original production Model M and don't think I would ever go back to it. It's extremely loud (friends would always complain if we were gaming together), keypresses are very heavy, and it takes up a ton of deskspace.

If the Model M or F are appealing to you, at this price point you should also consider some more modern production keyboards or even building your own from a kit + switches + keycaps. If you're after the heavy & tactile keypresses of buckling springs a board with Cherry MX Clear (common) or Green (less common) will probably satisfy you - I can highly recommend any of Leopold's boards with Clears in them.