I've had the 7500 for 3 weeks now and have noticed an improvement with the sound quality with my older B&Ws.
While the 7125 was good (and better than my old Adcom amp), the 7500 produces greater detail across the audio spectrum.
I have noticed that lower frequencies are tighter and more separation in instruments (double bass/cello), midrange is clearer, and highs are smoothers.
Just from those changes, going with the 7500 was worth it.

I decided to replace my speakers with the B&W 804S and HTM3S.
I was never able to try the Paradigms since there are not alot of dealers. One dealer has no product to demo, as they are moving, and the second dealer only had the larger (and more expensive) S8 and no center (C3/C5).
I'm not the type of person that buys speakers without trying them first, so this was a strike against them.
Then the B&W dealer is advertising a 'No Interest & No Payments for 18 month' which would help alot.
So based on these circumstances, I went with the B&Ws and hope to have them within a week.

The only other thing I am looking to do this month is to replace my older MIT rca interconnect cables for some high-end MIT xlr balanced interconnect cables.
Then later on I might see about changing out the older MIT speaker cables for a higher model to match the interconnects.