if it looks cool, you should get it, but if it looks REALLY cool and it costs A LOT, check lineage to see if it's worth it =/
I started buying coral for awhile just because they had big names on them... and then my brown acropora that I bought from AAF as my first SPS which I never cared about turned forest green with a very nice "ice" blue body =)
So I've learned my lesson, buy if you like what it looks like, unless you're a farmer and want to get something back for it =)