Queensryche's "Empire" has long been used by sound engineers to test levels. The remastered CD is very clean and dynamic, and would be a pretty good option.
Dire Straits' Brothers In Arms was the defacto standard in home audio stores when it first came out in the early days of CD Audio. The remastered version is a great disc too.
My personal favorite is still Donald Fagan's The Nightfly. It has never been remastered, although it has been remixed for DVD-A.