The $600 difference in price will be wasted on the Klipsch. You actually talking about less than a 2 DB change in SPL between the 2 amps at full power. At that level it is likely not even audible because you will be deafened by that time. The construction of both amps is solid enough to allow for a lot of headroom with those speakers. If you were using less efficient speakers the 7500 would likely be worth it just for the headroom. If you are considering updating your speakers to something more power hungry get the 7500 if not get the 7125 and a new OPPO BDP-83 or a great subwoofer from Outlaw.