Speakers for a large room needed

[Gaverick]

Looking for a set of speakers for the 6th form common room. budget is up to £300. The room is a large room, maybe 15m by 7m, and the speakers need to connect to a tv and a stereo. Also sometimes to a laptop or computer for use with a projector.

Do you have any recommened systems for this situation?

 

[Gaverick]

we have no amp lol, a surround system is preferred, i've been looking at the z-5450's and the creative s750, are these any good?

 

[Gaverick]

So is there any decent PA setup i could get for £300, i assume you need the speakers and amp?