There's a couple other things you can do after you buy good quality chain. Have you noticed the way the chain tensioners are "warped" and not flat.. they get that way over time 'cause the spring is only pulling on one side. you can disassemble them and move swap the forks top for bottom. Don't turn them over, flip the plastic pads over instead. Then they will be "warped" in the other direction, which will make them lay flat on the chain with spring tension.
The other thing you can do is make some plastic/nylon/poly pads and mount them on the frame areas where the chain rubs them.
To Invent, you need a good imagination and a pile of junk. (Thomas Edison)