Neither machine is very large. So, unless you're living in a dog crate (which I doubt), I suspect you could get both and keep them. With one of Dougg3's ROM SIMMs and a IIsi ROM image, the SE/30 will do 7.6.x... For that matter, with the Born Again patch, it should do 8.1 with said ROM. I did run one of my old IIsi machines under 8.1. It was slow, but useable. Felt like a Mac II or an SE running 7.x...

-J