Excellent choices! I remember being startled by Virginia Plain when I watched it on TOTP as a child - but there were so many other startling acts on at that time - David Bowie, Queen... what a time to be young! I discovered Roxy Music's albums when I was in my 20s, and I played them to death. I still remember some of the words of Out of the Blue, even though I probably haven't heard it in decades. I love the way the intro gradually comes in and builds up and the way that Bryan Ferry's voice just wraps around the music. But I agree that Brian Eno's departure made a huge difference. I hated Angel Eyes when I first heard it, but it grew on me massively. I still love it.
I really got into Fripp and Eno's music later on. A friend told me how it was meant to be almost mind-numbing etc. I came across No Pussyfooting in an old record shop - this was in the late 1980s - and as soon as I played it, I fell asleep. That happened every time I played it, so I started using it as a cure for insomnia - seriously! After a while, the effect wore off and I actually heard the whole album. From then on I loved it!