Look up Mobil Delvac 1300 Super. You may just notice that it has the best additive package in the business since it has a diesel rating.
You don't need synthetics on a bike with an oil cooler. Very little benefit in the Bandit because the lighter fractions in the oil won't burn off to form sludge. Save your money.
Energy conserving oils are thinner, which is why there's lower rotating losses in an engine using these light oils. They also don't protect engine parts as well because they contain less zinc. Choose wisely!
Hey, why isn't anyone using toilet-paper oil filters on their bikes? I'm serious: I had one that I transferred from car to car because it actually cleaned the oil, never mind just taking out the big rocks. And, wouldn't you like a 10-20% improvement in gas mileage? T.P. oil filters were used on many VW dune buggies running under the extreme conditions in Baja Mexico (alkaline dust). Those who didn't use them didn't finish. Check out old issues of "Hot VW's" from about 40 years ago. (Yeh, they had cars back then).
Herb
Oh no! An oil topic!!
If you don't fell like experimenting and you like to change your oil at normal intervals. Using Castrol GTX 10-40 will be fine for years and years. HOwever if you like to experiment a bit just make sure it doesn't say "energy conserving" on the back and you'll be ok. Alot of people like Mobil 1 15w50 synthetic, you can change the oil in longer intervals and it holds up better and allows smoother shifting.