to be perfectly honest, i don't want to recommend any "faster growing" corals. if you like sps, try a few digis.
if you like softies, grab some run-of-the-mill red and green shrooms, green star polyp, and xenia.....i cringe at telling you this!
my best advice is purchase nothing but awesome LPS, and feed them meaty foods regularly, and watch them grow. awesome creatures they are.