Which iPod/iPhone dock and speakers for dance class?

I teach modern dance and ballet in a huge high-ceilinged studio. I need to buy a new iPod/iPhone dock and speakers for less than $250.

Most important: The music must get loud enough to fill that huge room, and I need to be able to find the songs I want quickly. The system must be iPhone (4S) compatible.

Less important: Portable would be nice, but it's not essential.

Not important: I do not care about accessing the radio, nor do I need to adjust the EQ.

These are my questions:
1) What should I buy?
2) What else should I consider when making my choice?

1. When is the class
2. What about remote control?

Finding a sub $250 amplifier is easy. It's not my choice, but here's one http://www.zzounds.com/item--ALETAM

I have a different amplifier and a Bluetooth receiver (about $50) that lets me link my iPod to the amp and keep control of the music in my hands. The Alesis doesn't list the output, but I imagine it's about 40 watts.

If you get the Alesis, or any other solution, from Zzounds, you can return it within 45 days if it doesn't work out.

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