Because of the convienence, I go to AutoZone, buy Mobil-1 4T 10w40 full synthetic, and a Mobil-1 filter. Filter usually cost about $15 and the oil is usually about $10-$11/qt.
I also go to the dealer (when I plan for it, that is) and buy an OEM filter and Honda HP4S 10w30. It runs around $14/qt.
My bike has the best and smoothest shifts, on the HP4S.
I get about 3000 to 4000 miles from my oil. I can tell when it's time to change by the feel of shifting and the color of the oil.