Individual cymbals sound very different. Especially the older ones.
This is a huge subject, so I suggest you search around the various drum forums and use something like Google to find more information.
There is the odd online dealer with sound samples, but mp3's aren't always reliable. Plus, what sticks were they using, which mic, in what size room?
http://www.cymbalcellar.com/

I have three crash cymbals, 16", 17", & 18", plus the 20" ride. I bought them on ebay and they sound great. That is, for what I use them for at this time. I wouldn't use they for Rock,etc. that would be out of the question. SO, they could be really great for you, depending on what type of music you want them for.Mine come from 1970 and needed a little cleaning. No big deal, just a cloth and some good Zildjian cleaner, polish.They had been in storage and had a bit of cr**p to be removed. Since then, no problem. I got them for under $100.00 each and they came from the same seller, with letters fromn prior owner. (Cobham). Check it out on ebay from time to time.  God Luck.

There is one seller on there that usually has sound samples of everything they sell. I think they're called indoor Storm. I'll check as soon as I can and get back to you.