FWIW, all my 6 Istanbul rides, except 1, crashes like a champ, rides like a dream, and has what I consider perfect sounding bells.
(the one cymbal does 2 out of 3, but it has a small bell, not my fav)
They are the only holy Grail cymbals I ever owned.
Their less expensive, machine hammered Xists series IMO could be the best value in cymbals going. I really dig mine. I gig with an 18, 19, and 21" Xist ride. I paid $214 for the ride, and $154 each for the crashes.
They crash, ride and bell just as good as the higher priced ones.
You don't hear about them very much, so I feel they deserve props. For a low cost cymbal set, there is no contest.
I'm really curious about those Heartbeat cymbals Martin has.