Yup...read the whole thread this time...lmao.
My buddy just put a set of these rims and tires on his 07 convertible and they look awesome. He dropped his car 1-1.25 inches and it looks better than ever!!
Go here for your tire size calculator. It will show you not only height differences but also width.
http://www.miata.net/garage/tirecalc.html
The only drawback I see to going to the larger rims and lower springs is ride quality. It can get quite 'jouncy'. Also...your brakes look TINY inside those larger rims...but that's just my opinion.
Sorry for giving you a hard time earler...wait..not I'm not...that pic was HUGE!! lol
Good luck..hope this has helped some.
RH