I have 5 blue-green chromis and they have worked out fine.  Minimal squabbling, and nice colors.  The schooling action adds a great touch.  I also have a 55.  Give them lots of hiding places (with 70 lbs of rock that shouldn't be a problem).  I think mine get along so well because they were very small (about .75") when purchased, so they've grown up together.  They're now about 2 - 2.5" long. 
 
Cardinals can be nice, too and I would definitely second the nomination of the long-nosed hawkfish.  They're definitely interesting, but can be picky eaters sometimes, and you don't want to keep more than one.
 
Just my two and a half cents worth.
 
Rich Lewis

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