definately space! unfortunately i live in an apartement with 1 spare room where i manage to put in 2 arcade cabinets en 3 pinball machines (i currently own one but am in the market for 2 new ones) But every time i want a new one i have to sell another one. So never can have more then 3 in my collection
in the netherlands there are not that many houses with basements beneath them due to high water levels. I wish i had a gameroom basement