Short of actually listening, it would help to know how much power you're actually drawing now out of your 750's.
How loud do you listen, how big and sound-absorbent is your room, and how far from the speakers do you sit? The Revels are power-hungry, but 450 conservative watts would probably be more than enough in a lot of situations.
If you don't know what kind of power you need, you can get a Radio Shack sound level meter, and just do the math (or post the readings and someone can tell you what kind of power you're using).
How loud do you listen, how big and sound-absorbent is your room, and how far from the speakers do you sit? The Revels are power-hungry, but 450 conservative watts would probably be more than enough in a lot of situations.
If you don't know what kind of power you need, you can get a Radio Shack sound level meter, and just do the math (or post the readings and someone can tell you what kind of power you're using).