about your ideas:
to me the zele body kit kicks nismo's out the water
and if you got a zele body kit, you'd probably want to go with their exhaust
i think the nismo is higher than a tour+sport+nav bc they're trying to sell it as if it were an s2k CR (i think a lip, bad spoiler, no air/audio (unless you pay more for them in) ) -feel free to correct me on the CR