Nothing Rocks like an ATC SCM-12, if you have a smaller sized room these speakers work well against the wall. In a larger room you can sink the full power of the A300 into these speakers with no worries.
2nd pick would be whatever Dynaudio fits your budget with a 6" woofer, 3rd pick would be at a little higher price range is the Dali Helicon 300, especially with your preference for a vinyl source these speakers could sneak past my previous recs in your system.
Polk, Paradigm, B&W are very good but are not on the level of these lesser known speakers who use much better drivers (woofers/tweeters) and who have as good or better skill in their execution of design.
2nd pick would be whatever Dynaudio fits your budget with a 6" woofer, 3rd pick would be at a little higher price range is the Dali Helicon 300, especially with your preference for a vinyl source these speakers could sneak past my previous recs in your system.
Polk, Paradigm, B&W are very good but are not on the level of these lesser known speakers who use much better drivers (woofers/tweeters) and who have as good or better skill in their execution of design.