Okay, so what do you guys all do for greetings?
I actually tend to use "Hey__(person's first name)__," quite a lot, which is probably a tad too casual, but I find that it's a good way to start things off in a relaxed, comfortable tone. The only time I don't use this is for people I don't know well or at all, in which case I'm forced to use something else, which I usually find annoying. I'm kind of attached to my "Hey___" greetings.