For what? General rock climbing... Winter stuff... Alpinism...?
I do mostly the former with a bit of the second. I had a Petzl Meteor III which worked great when it was finally called upon to work, but I replaced it with an Edelrid one (can't remember the model name) which is very similar but fit my head better. Needless to say you'll get a variety of answers on here.
But basically - like most stuff - think about what you want it for, decide on your budget, then go to a shop and talk to the staff and try some on.
Get one that has plenty of room for stickers
I used to have a black diamond half dome, it was pretty basic, and got a bit sweaty as it didnt have any vents, however it did save my life when i fell off and smacked the back of my head on a rock, so i am happy to recommend them.
I now have a CAMP armour, its also quite cheap, and has a few vents and more comfortable padding than the old black diamond did, seems quite good up to now, but it hasnt had much action yet thankfully.
I have a Petzl Meteor III for trad. It's nice and light, well vented, and comfy. It also has removable foam inner pads for washing if you're of a sweaty persuasion.
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