I understand your conundrum but unfortunately there is no simple or easy answer on what the solution is. Sell them all and then mutter every time you want to do something and cannot because you no longer have the tools to do the job. Sell a few - how do you chose - draw numbers, flip a coin, "eeny, meeny, miiny, moe", ask the wife, phone a friend, etc.?
If you have the room might as well keep what you have and enjoy the frustration that goes with owning too many toys that under a less profitable lifestyle we wouldn't or couldn't afford. There are much worse problems to have and if you can enjoy the machines you have accumulated.
One rule you might consider adopting is that if you get the urge to own one more one that you now posses must find a new home - a lot like having to kick a child out that you raised from birth and not easy to do. Ah - the joys of having a little too much money and time on your hands along with the ability to repair rather than throw away can be a curse for some of us.