I've had excellent experience with Mermaid. Good equipment and cheerful top-notch factory support on the sole problem I ever had with them.
If you search threads you will find a number of TFers that highly recommend a company in Florida that builds AC units to spec at a good price. Can't remember the name, but looked worthwhile to check out.
Are you thinking about Ocean Breeze in Stuart Fl? I have one of their units. It seems to work fine.