i wud suggest not to buy a cheap 5.1 to couple with the AL 2.1 and try making a 7.1 setup. With cheap stuff u won't be able to differentiate the 7.1 from a 5.1. If u want cheap surround sound and don't want to dispose ur 2.1 buy another 2.1 and couple them to make a 4.2. I think the sound quality will be better. Use the better of the two 2.1 as the front speakers.