In case anyone's interested to know. There's finally a budget case from Cooler Master with a bottom mount PSU in the form of the Gladiator 600 and also the slightly costlier Xigmatek Midgard
Was wondering, would it be time to have another list with cases that has it's PSU located at the bottom? Stuff like the Cooler Master RC-590/690 or Antec Three Hundred.