I run a Cannon SuperMini 20", 7-tooth sprocket, Oregon clutch, PS3 chain, etc. on a Stihl MS-261C-MQ saw. Very fast cutting and the Cannon bars are very good. To be honest, hot saw mods aren't much of an economically efficient choice in a production environment. Buying saws that are sized right for the job you're doing is the way to go. I'm not a young guy, out there trying to make my fortune cutting trees into smaller pieces, so I'm in no hurry to get anything done. If I was, I'd probably stick with stock bars and chains, which are anti-kickback, and keep a couple of sharp spares on hand. I'd buy a bigger saw before I'd waste time and money on modding the hell out of the saw. That 261 of mine, I have to be very careful with it. The kickback potential is greater than it was before I changed stuff out. That's not really what you want if you're up in a tree or if you let less experienced people/groundies use it. Just thought I would point this out, in case you hadn't considered it. I'm actually thinking about putting the stock bar/chain back on the 261 and use that stuff on another saw that I only use on the ground.
If you're only going to change the bar, and use the stock chain, that's another matter. The Cannon bars are pricey, but they're better. Can't speak for the Sugihara bars. On the tophandle saw, the Cannon bar will run true and not deform during a cut and will outlast the Stihl one. But I'd stick with the PM3 chain.