Within that budget you are better off starting with a 2.1 or 3.1 system. You will get a higher quality speaker selection initially and you can add 2 more down the road to get you up to 5.1. There are complete packages that are around that price range in 5.1 and even 7.1, but they aren't going to be solid IMO; I'd stick to 5.1 if you have to go with a full package.