Any reason in particular for the OEM Air or Oil filter, other than the "condom"? (others aren't that much better, others are not as good, others are more expensive, don't provide any more power / torgue etc.).
Warranty is not an issue with either, as the law will not allow the Manufacturers in my area to use that as an excuse as long as I can prove I followed stated schedules, and bought filters that met OEM specs. I've heard good things about the Purolator Oil filters though, and they may be easy for me to get.
That's the real kicker. The local shop (not the dealer I bought the bike from) runs high on prices, and the dealer I bought the bike from is too far away for regular trips. I may be able to get 3rd party stuff cheaper and quicker when I need it, but I don't want to risk hosing up the engine just to save a couple of bucks on a filter.