Donating skin

I've got an appointment booked in a couple of weeks to get my fourth tattoo done.  It's a simple design but it's going to be very interesting to see how it comes out since I've volunteered my upper arm as a canvas for an inexperienced tattoo apprentice!  We're talking about prime tattooing real estate here, so at this point you may quite legitimately ask me what the hell I'm thinking.  This is permanent after all.

I've had a design picked out for a long time that's relatively simple and insensitive to minor imperfections, getting my tattoo and getting to help out a budding artist seems like a win-win situation to me.

But I'm curious to hear what others have to say ... would you get tattooed by a new artist?  How about an experienced apprentice?  What type of pieces would you consider if you're going to an apprentice vs. an established artist?  May as well open the discussion up a bit, do you have a particular artist you go to?  Who are your favourite artists and what are you favourite pieces?