Out of the jap class, Honda for sure, build quality is great there are only a few pet peves I have about the 600rr after 4 years of ownership. And they are tanks when it comes to reliability! I hav ridden my rr like she was supposed to be ridden and I have had no mechanical issues whatsoever. 9 trackdays and around 10000 street miles and I have had not one mechanical issue. That makes me happy. A close second would be yamaha, and a far off third would be Suzuki for the fact that every duechebag I have ever met on a bike has ridden a Suzuki. Not saying that everyone who owns a Suzuki is a duechebag I'm just saying almost every duechebag on a bike owns a Suzuki. I guess they've picked a target market and they are sticking to it last would be kawi, mostly for build quality reasons that's about it, though I have seen a couple of well built kawis latelly. Which is a plus. But really you can't go wrong with any of the jap bikes.