OK, the Cal Tech Mechanical Engineering department did a filter test about a year ago, they said that the PureOne filter is actually the best, after that K&N is slightly better than OEM, and OEM is better than most of the off brands. Unfortunately for you (and me) suzuki threads are propitery and they don't make the PureOne for Suzuki's. I use K&N, and change my oil and filter after every trackday.
As for Oil, I use Mobil 1 in the KTM, and Castrol R4 Superbike in the GSXR. Here's the thing about car oil, you CAN use it in a motorcycle, as long as it is a low-detergent type of oil with no "friction modifiers". They detergents and "friction modifiers" will bind with the clutch plates and cause slippage and eventual wear. The "friction modifier" is usually molybendium. Check the back of the jug and see what additives are in the oil. If you want to use car oil I recommend Rotella T Synthetic, my father has about 30k miles on two different bikes with Rotella T Syn with no problems at all. (He uses K&N filters too)
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