Out of your list, I would choose the gem, black and Achilles.
A word of warning. My tank is a little over 5'. It's actually 5'x3'x3'. When I tried to put 3 tangs in there, they were very territorial. 2 tangs were fine though. Maybe you'll have better luck than me.
I have an achilles and I would agree with the others to take him off your list. 5ft isn't enough, we're in the process of upgrading to an 8ft tank just because of him. Not to mention the aggressiveness you'll have issues with...
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