Hi Don,
I have not heard the LeAmps. I can tell you that I have the 770 and have absolutely no complaints about its performance. I personally like the simplification of having all 7 channels in one "container". Works for me. I personally do not believe mono amps will sound any better, but many "audiophiles" do. Try the 770, you can always send it back if you don't like it. Well, that's easier said than done- it's a HEAVY monster!