I have successfully used South Beach Cruises they have a couple of different URLS. I have worked with them in applying credit from past cruise certificates and the like. I'm not sure if I would use them in trying to set up something complicated and if they would " be there" in case of emergency. But for simply booking a cruise they have been fine.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015