Hi Jon,
I was going to recommend a speaker I purchased about 5 years ago but when I googled for them, they no longer are made. So, if I were in the market for outdoor speakers and was going to spend between $100-200, I would look seriously at cambridgesoundwork.com in their outlet store for "B" stock. Also, serious conside Radio Shack's outdoor speakers. They have a very generous return policy and you can hook them up for a trial run.
Yamaha, Polk Audio, Advent are all great brands but I feel you can get a better bang for the buck by looking around.
Good luck,
L