Thanks for all the info. I went with the K&N filter, and the Penzoil Ultra synthetic, which I'd never seen before, in 10w30. I suppose I was conditioned to prefer Penzoil, but I'll give synthetic a try first and maybe try something else next time.
I also changed the PCV valve. I'll let you know if I notice anything great or terrible.

Still open to suggestions for the next oilchange!