A good pair of jeans should be simple. Dark selvedge Japanese denim with a minimum of decoration.
Take these jeans from Japanese brand Uniqlo for example. For only £34.90 or $49.90 (depending on where you are), you get top quality selvedge denim from the globally renowned Kaihara mill for only a fraction of what other brands charge. Whether you choose to wear these with Adidas or Alden you will be good to go.