Regarding the "Never take a band tattoo" -argument, I think I must reply with my thoughts on the issue.
I have a Dark Tranquillity -tattoo on my chest (the old D-above-T logo) and spent many days thinking whether or not I should take it. Finally, I had it made half a year ago and have not regretted it since - maybe I will someday, but that's impossible to know now. My main point is: this tattoo of mine tells of me, my thoughts and tastes in year 2002 - if my mind changes through time, then it shall. It won't be such a big deal - I still have something on my skin that reminds me of these times (when Dark Tranquillity was an excellent band and their music meant a lot to me).
After all, even if I had a different kind of tattoo, something that I had designed myself and thought as great today, I could change my mind tomorrow - I know many people who regret their self-designed tattoos, yet I can well imagine someone who has a Slayer-tattoo watch him/herself in the mirror and smile as (s)he remembers those days gone by. And I think that is the whole meaning of a tattoo.
-Villain