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i'd say cams are a good early mod as well. they will give the engine much better top end power, something KA's are sorely lacking. you may lose a little low end tq, but it shouldn't be enough to bother you. they are also a bit pricey ($400+), but combined with intake/header/exhaust and a chip/ecu tune you should have a pretty good NA setup. thats only in reference to the engine tho.
as mentioned by nismo240, brakes and susp are probably a better starting point. either new rotors (maybe slotted?) and good pads (hawk, ebc, etc.) or if you want a little better, Q45 brakes are quite good. if you use q45 brakes you can get away with the stock master cyl, but an upgrade is recommended (especially since the stock brake feel isn't that great to begin with). if you get 300zx or similar aftermarket brakes expect to require a bmc.
suspension is also a viable first mod, since 240's are a little soft in stock form and most are probably worn out by now. if you just want it to be better than stock, a quality spring shock combo is ok if set-up properly. 1st, don't lower it more than 1-1.5" without coilovers. 2nd, good shocks are a must, and adjustables are preferable. tokico makes a matched spring/shock kit that should be decent for ~$400. coilovers are obviously much better, but also cost much more. expect to pay ~$1K+ for a good set of coilovers. don't overlook sway bars, poly bushings, etc as fairly inexpensive ways to improve handling as well.
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KA=Kick Ass
SR='S'all Right...
RB=Righteously Bitchin'
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