JCW1969

If anyone could advise me...I own a pair of KG-2's and just recently bought a RC-3 center speaker for my apt. For rear's I am using an old pair of AR-7 bookshelf speakers with new cones. These are all being powered by a Pioneer Elite VSX 36-TX receiver. My question is - would updating the rears with new bookshelf speakers make the listening experience better? I haven't set the system up yet because I just moved and bought a new TV. Any thoughts would be appreciated. Thanks.