www.megadrum.info

The beauty of MD is that you can go the drum shop and order any pad or cymbal from any manufacturer, safe in the knowledge that your Megadrum will get the very best performance out of them.

Take a look at the Triggera cymbals - metal not plastic.

You don't have to be concerned about using 3 zone cymbals with megadrum. I had tried all possible designs and it works without any problem (single, double, 3 zone, piezo/piezo/switch, piezo/switch/switch).
This is a European haven for customizing your own, unique e drum set. I'm shure that you can find similar shops in USA.
http://www.drum-tec.de/index.php
My choice in this moment will be drum-tec pads and yamaha cymbals, but there's roland too (they are more expensive for the same level of product quality). I would avoid alesis.
I mean for the similar price between roland 125 or 108 and drum-tec pads I choose drum-tec because they are real drums with real wood shells and they look awesome. I don't mention triggering cose I guess that there will be no problem.
I adore those drum-tec bass drums.
Golden grail of electronic drums. Enjoy:
https://www.youtube.com/watch?v=pkNbnkTH4g8