They're worth what somebody will pay for them. Seriously. The market has fluctuated so much lately, it's sometimes hard to sell something for what it's worth, while other times you'll see something sell for MUCH more than it should. Here's my take, given my outlook on the local used market (music stores/craigslist). Two prices: what I see them offered for/what I see they are actually selling for.

Zildjian K hi hats 14” $180/$130

Zildjian K Dark Crash 16” $150/$120

Zildjian K Dark Crash medium thin 18” $175/$125

Zildjian K Dark Crash medium thin 16” $150/$110

Zildjian K custom medium ride 20” $200/$140

Zildjian Edge flash splash 10” don't know

Paiste 404 medium ride $120/$75

Thanks for your help