I've always been partial to the hounskull, I think it looks sick as hell either with full plate harness or even just with lighter chain/gambeson and gauntlets. And I like the kettle hat because it's got a real good balance between protection and practicality, if you absolutely have to have your face uncovered for visibility reasons then it's about as good as it gets

Frog-mouth is also fun just cause it's silly looking, I don't like it very much for practicality though