Who has experience shipping large speakers?

I sold my Soliloquy 6.5s on the Audiogon auction. To my surprise after boxing them they weigh 175 lbs! Now shipping has become more complicated and more expensive. They need to go to Newark NJ from Orlando FL. I would greatly appreciate any recommendations for a shipping company. The quotes I'm getting are all over the map, ranging form $285 to $725! Unbelievable.

Mark