I'd agree with the Polk recommendation, even the smaller Polk R15's sound amazingly good at their usual discounted price of $79 and I've seen them on sale at Fry's for $49 a pair.
A truly kid-proof option that would be a step up from the cubes would be to get a pair of Radio Shack Minimus 7's off ebay and upgrade the capacitors and crossovers with the kit sold by 'litekeys', also on ebay. The all-aluminum enclosure and grills will take a beating and they do sound pretty nice after the upgrade.
A truly kid-proof option that would be a step up from the cubes would be to get a pair of Radio Shack Minimus 7's off ebay and upgrade the capacitors and crossovers with the kit sold by 'litekeys', also on ebay. The all-aluminum enclosure and grills will take a beating and they do sound pretty nice after the upgrade.