For me maybe it boils down to which bolt pattern. Eventually I'd want a set of salt flats wheels which I haven't found in the 4 inch pattern. To get the 4.5" there's much more involved. Its like how much do I want to spend first so I can spend a grand on wheels later? How much do I really want those wheels?
what I like about the scarebird is it looks easy and quick, no scrounging junk yards, just head to Napa. And the parts could be accumulated piece meal, there's not a big bite to get a kit.
But since the toyota rotors have to be drilled anyway, couldn't they be drilled for 4.5 inch?