Sure, start with 501s in Levi's LVC line. You'll get better quality, selvedge denim and they'll be based on 501s from different eras (so slimmer legs, wider hem, etc etc). If you're lucky you can find some with Japanese or Cone Mills (USA) denim. LVC are often in the sale, shop around.

Then look at the Japanese brands. Most of them are reproducing 501s from various eras. FWIW, I like TCB (https://tcbjeans.myshopify.com/) - the price/value ratio is superb, the quality is better than LVC and retail is cheaper. Their 40s and 50s jeans are both brilliant and they age amazingly.

Hope that helps!

Last time I bought jeans I accidentally got the 501s because I didn't realize they were button fly. I thought I was going to return them but I ended up giving them a shot and now I love them. They're way less trouble to do up than I was expecting. (And because you work from the bottom up, I've never forgotten to close my fly... something that I managed far too often with zip flys)

The Unbranded UB301 is probably a good place to start.

Uniqlo's selvedge jeans I've found are pretty good, although not button fly.