Trying to tie product quality and value to you to market prices is a very bad place to be. You are essentially trying to build up your stereo based on perceived fiscal value instead of pleasure you personally derive from it. Unless you are running a used gear store I think this approach won’t help you enjoy music very much.
Consider that a brand name can make a difference in selling price from 2x on upwards but that’s no guarantee you would like it 2x better. You might also fall in love with something older, or less expensive. Will you buy the less expensive gear you like more?