I'd advise against getting a band logo stamped on your chest, your favourite band at 18 will not be your favourite band in your 30s and 40s, so really think about it before you go for it.
Now, on the topic, I have a small memorial tattoo of The Rev from Avenged Sevenfold, and while that may seem hypocritical considering what I've just said, I thought long and hard about getting it from the day he died to the time I got it, which was about a year, the difference is, this ink actually holds a hell of a lot of meaning, as well as multiple meanings. (That and I actually did meet the guy, had quite a deep conversation with him too.)
It's simple, I got the FOREVER script from the front of the Nightmare album, on the tombstone inked on my wrist, and believe me when I say the only reason I even considered it is because it's extremely significant for me, I go to sleep seeing it as a reminder to live my life every day like it's my last, to just enjoy everything I have and not let stupid things keep me down.
What I don't understand is people who have gone out and gotten the Deathbat inked on themselves at 18.