you will get VERY little from the tune except for the extra maps and some added driveability. I would get all the mods you want before even thinking about a tune.
that said if all you're currently looking at is a motordyne plenum, definitely get that before the tune. without a proper tune you lose power and torque, iirc.
if you like torque I would suggest HFCs or test pipes. a catback will also add some torque, although not until a bit higher in the rev range, i.e. past 3000.
you can also extract more torque by getting lighter wheels and getting stiffer mounts (poly-u trans mount). the z is known to have very soft mounts for comfort purposes. I'd also include a diff mount but our diff mounts make no sense, as they are nonserviceable, and only a handful of owners have gone the trouble of trying to change the mount. suspension mods will increase the amount of torque getting to the ground as less of it is spent on flexing the suspension geometry. things like springs, sways, tower/ladder bars, struts, shocks, etc.
such things are very intense and can radically change the feel of the car. you also mention you're not a bolton person so I don't know how you're going to get your torque if you don't have bolt-ons.
ultimate torque solution? turbocharging or supercharging. you'll have more torque than you'll know what to do with.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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