It's a pretty wide-ranging question. Is it more that you want to run a weird OS or that you want exotic looking hardware? Do you want to actually use it for more than a few hours each month?Very random thread:
What is the best mainframe (by your justified opinion) what the best mainframe you can have that one might be able to have at home - e.g. while it might be possible that someone has say a 1401/360 or something at home it isn't likely but might have say a PDP8 or something that they picked up and able to maintain at home that doesn't require that they have mega bucks.