Opinions on tire size after lift?

[Ldub]

So the 285/60-18 Nittos I have on the stock rims right now are rated for a 8-9.5" wide rim, however we all know our stock rims are 7" correct? So would the 285/65-18 Nittos that are rated for 8-10" wide rim work on our stock rim just as well as the 60s?

Probably be fine...since there will be more sidewall. The key to understanding tires is in the "aspect ratio", the second number in the equation.
285 is the width in milimeters, 65 is the sidewall height, expressed in percentage of tread width.
The last number is rim diameter.
Keep in mind, the higher sidewall is great for off road applications, but can get a little squirrely in street cornering. (lots of sidewall flex)
I keep mine aired up around 45-50 psi on the street, & use a higher ply rated tire( load range C, preferably D) for more sidewall stiffness.

[etlsport]

heres a handy little site for figuring out what size tires you want

http://www.miata.net/garage/tirecalc.html