I had a h/k 525 which is very similar to the 630 and the 970/7125 blows it away. Your speakers are more sensitive so unless you have a very large room the outlaw combo should prove to be all the power that one could ask for. That being said I have not heard the 990/7700/7500 which are most likely even better but for the money the 970/7125 is a great upgrade from the 630.