my sugestion to you is to save up some money and try and get like A's or even just some regular zildjians. I would stay away from the ZXT an ZBT's if you can.
If thats not an option then I guess I would go with the ZBT's.
I just looked them up on their web site and that is the top of the line for their sheet bronze cymbals.
I would look thru ebay or musicans freind, or were ever but try and get a box set that has a hh crash and ride.
if you are wanting to start a metal band then I suggest saving your pennys and going with the Z customs, Yea their exspensive but they sound great with metal.
I would tell you about sabian but I dont know anything about them.
what you should do is go to www.zildjian.com
and you can look up some of the bands that you like and it will tell you what they use in their seet up and that can help you as well.