What does the K&N filter do differently to the standard one??
There are some pretty cool gear knobs floating around ebay, i would have a look there. and theres also the toyota TRD ones.
K&N filters have better airflow to the engine increasing SOME power and better fuel consumption compared to the crappy thick cheap air filters you get from Supercheap. Plus they have lifetime warranty and you never have to change air filters again. I just bought one from ebay for 75 bucks coming from VIC in a few days. If you went somewhere local like Repco or something they'd charge you double that!
I personally think a great air filter is essential for any car!