Buy a pro audio amp. They're designed to take abuse in commercial sound systems and operate in less than ideal condtions of use.
However, I agree wtih Shadome that damage to the speakers is a bigger condern than what amplifer is used.
If you don't trust the operation of the system, then get a pro audio amp with built in DSP. This would allow you to set the amplifier limiters below the point of clipping or below the point at which the speakers would be damaged, which ever is less.
Something like a Crown XTI-1000 probably would be more than adequate power-wise. It is rated for 8, 4 or 2 ohms operation and has the built-in DSP functions.