Die-casts are obviously heavier, but as mentioned you can get them in other sizes.
You can offcourse experiment. Make it a point to have different flavours. Depends on what you want to use it for.
No secret that I personally just want a USA Custom when I can afford it. It's just what I like. Not very innovative, more or less just the good strat or Les Paul of the drummer world, but that's sort of my taste in guitars too, it's all I want and what my main influence plays when I think he sounds the best. What can I say. I'm boring.
I've rarely played a kit I didn't feel comfortable with, but those instances for me was a PDP at a school I worked at, some sort of DW Collectors at another school. Also, though I think many people sound great with the modern warm Sonor thing, it just isn't for me. The Classic Series are a take on it, but still for me, close but no cigar. Stubborn old bastard that I am.
There it is, that sound that I know, there's that sound that I love, there's that familiar sound, there's that great sound. Hypnotized yet?
If you really love you DW Collectors, just get another one. Plenty of wood combos there though, right.
Going light, there are offcourse these:
Here in Norway, the cheapest pro kits are Pearl Reference. Great used kits everywhere of all configurstions. It's a bit strange, but you almost can't give tem away.
Yamaha is the big thing and offcourse, largely due to Benny and Jojo, I would think, Sonor has grown a lot. People want the SQ2s though and they're a bit out of reach for the average player.