Also it's worthwhile adding a K&N filter, and also cutting off the front of the airbox (hard to explain but you'll see what I mean when you look at it)... you will get better airflow then.
I'm not into rice, but I'll admit it does make it sound really good too!
Another thing to think of is the blow off valve... the factory one is prone to failure, you can replace it with a Bosch one from any Autobarn.. about $50 for the valve and you'll need a hose and some clamps for another $20 or so.
Suspension wise, a front strut tower brace makes a great difference, they're only $100-$150 second hand from most importers.