I am huge fan of Prog Rock and both Rush and Pink Floyd are my favorite Prog Rock bands but man there was a great deal of quality Prog groups that produced material in the 70's. So many people think of Rush, Pink Floyd, Genesis, Yes and the likes as the only good Prog from the late 60's and 70's but there was so much more.
I love Camel and Mirage is a Prog Rock masterpiece. One of the finest albums to come out of the 70's and still holds up to this day