I have a Limar Xmtb (?) I think it's called. It is super light, and very comfy. I have a kid sized head and can still adjust it small enough. About a billion vents, and it has a piece of fabric on the chin strap to hold the excess strap and be softer on the chin, which it is. The only thing I'd complain about is the fact it's so light I think it would be stuffed after one stack. There's no outer shell, just a layer of paint.
Otherwise I ride a Pro-Tec B2 (the big Goomba looking ones) because it's the best, really.
It can take multiple stacks (they say three non shell cracking). I've fallen many times, but don't recall ever hitting my head. It's lasted three years now with minor transport scratches and only just needs the pads replaced. It's very warm, but I feel safer in it.