welcome rach
I thought about a memorial tattoo years back when my nan died but after chatting to the guy in the studio i changed my mind. really glad i did now too. i got a tattoo yeah and i know that i had that particular one done for that reason..
One thing to consider if youve not done already is that people will be asking you alll the time. and it'll get to a point where you'll be fed up of telling people the reason behind it, also some people may be affraid to say to you WOW nice tattoo because they may not want to upset you!
Just worth considering