trying to decide on either 2.1 or 4.1 speaker setup. Is 4.1 really that much better? the thing I dont like is you have to figure out a way to place speakers behind your seat which can be hard to do in a room without getting in the way. I could either get a set of altec lansing 641's for like 150 delivered, or a pair of monsoon 9' for 79 bucks. what do you think?