I'd echo all of the above; you get what you pay for, and your ears will tell you if it's what you want for your music. I'd add a couple of details, which concern the higher-priced cymbals, mostly, but is good for all, basically.
Most quality cymbals are cast, and then turned, on a lathe, which results in them having grooves in them, in similar fashion to vinyl records (remember them..?). This helps to explain why careful handling is key to having their original tone maintained throughout their life. Most folk take care handling vinyl, and wouldn't dream of leaving grubby fingerprints on the playing surface. Once degradation has started, no amount of cleaning will restore the music; the only real solution is to keep them as clean as possible for as long as possible. Thus it it with cymbals; one does not 'clean' them, one maintains their cleanliness. Getting them shiny with Brasso and the like may be good for the video shoot, but the sound they had in the studio is then ruined. My cymbals, for example, are kept in 'Cymbags', until they are on their perches; I remove the Cymbag when I play, and put it back immediately when finished. The metal is never touched by human hand, only the tip (olive...) of the drumsticks. I use nylon olives, which leave no marks on drum heads nor cymbals.
Another factor to be considered is strength. By their function, one is hitting the cymbals; they must be able to resist this. The more delicate the sound, the more delicate the cymbal, generally (and the more expensive..!). When playing in the UK, with light folk/pop groups, I had splendid Paiste 602 cymbals, which sound awesome (to me...). I moved to France, and toured in variety bands, playing larger venues, with no PA support (mid-seventies...). 'Variety' is what the name suggests : various styles from '30s dance music (musette...), '70s popular songs and some rock stuff. These latter did for my cymbals, as, although not being a particularly heavy hitter, they did not appreciate being played in that fashion. I replaced them, as and when they split, with Paiste 2002 versions, which don't have the same crystalline ring, but withstand rock rhythms much better. I now play with a mixture of Paiste and Sabian, but insist on using, in our micro-studio, my Paiste 602 Sound Edge hi-hat, as it's the most responsive to the way I play. I don't 'leather 'em', though.
Although I have bought cymbals second-hand, if the price is right and the condition is pristine, but I prefer to go through a rack of cymbals in a shop, using my sticks, and choose by ear, as there can be quite some difference in tone and response, even from the same model. Slightly academic these days, as I now play mostly e-drums, and can choose from a vast selection of top-end instruments without spending a fortune or deafening fellow musicians on stage. No, it's not the same as playing acoustic, but I get a repeatable great sound without having to worry about mis-handling them.
Disclaimer : I'm a drummer; I could go on and on for ages on the subject, so I'll stop now. Hope this helps.