Not a big fan of Nitrous... as it is really just a temporary boost in power.
OP its either do the 4 major bolt ons (intake, headers, test pipes and exhaust) get a tune and call it a day. You can then move on to a better clutch setup and possibly 4.08 gears to make it feel faster.
But if that doesn't fix the speed / power needs, there is no choice but to s/c or tt the damn thing.
The way I built my old Nismo, was bbk and suspension mods, then bought a nice cat back for the time being. when the power itch couldn't be pushed back anymore, I TT'ed it. Worth every penny on the highways when you are cruising and switching lanes in 6th gear, never needed to down shift lol
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