whoa haha, u saved me and a mate some time going there to ask for exactly the same thing
what resonator/hot dog did they give you? and what type of metal is it? is it mild steel or stainless? and is the bend mandrel? $290 seems to be a fair price but a bit on the expensive side... unless it includes all the things i mentioned...
they installed my headers when i port and polished them
to answer your question, yes its worth it. i recommend you get a decent resonator or "hot dog" to stop the drone/loudness of the exhaust. it will give u a headache after a while lol
also a x-force muffler is a good choice, i'm getting one hopefully soon when the weather is nicer and not raining... i suggest you wait for one to sell on the forums. same sh*t for 2nd hand and its equally as good.
with the suspension go superlows if you have the money just pop into pedders and get their xtreme coilovers. i'm running super lows on mine for 7 years + 2 track days and the struts still haven't crap their daks yet. but for your struts with the life on them, i do not know if this is a good idea.
the wheels? 17 inch looks good but the tyres will set u back more than the 16s. thats why i keep my stockies haha :P