Miata-MS

Hey guys, i finally got a job and therefore will likely have the cash for my Megasquirt and Greddy turbo kit in the near future. One question I had, however, is what other turbo's could be used w/ the Greddy manifold once i feel the need to upgrade? I'm not terribly knowledgable about the different flanges...basically just aware that there are different ones and not all interchangable. Characteristics I'd be looking for is low rpm spool, and maybe 160-180Whp max. Doable?

Thanks for any advice. (and if anyone's selling their greddy... there's an interested buyer )