Good speakers for wedding reception?

I'm looking for some good speakers that I can hook up to my Macbook Pro for my wedding ceremony and reception. We are expecting about 100 guests, the ceremony is in a small area outdoors, and the reception is in a historic train station with high ceilings (fairly spacious). What type and brand of speakers would be good for this? I was looking at M Audio Studiophile BX5a's and Bose Companion 3 or 5, but I don't know nearly enough about speakers and audio equipment to be able to pick the reviewers that actually know what they're talking about.