I use the Behringer Eurolive 1220's for both my karaoke shows and for band performances. 125 W, 12" speaker with horn, good controls and they come with a feedback control loop, but I rarely use that. They're a nice wedge and you can daisy-chain them with either 1/4" or XLR cables.
I actually also use one for my practice amp. It's pissed the neighbors off a few times, so it'll thump pretty good, due to the 12" speaker in it.
Oh yeah, they used to be around 200 bucks, but they've finally topped that price. You can bump up to the 1320's, that check in at 300W if you need more juice.