Mine too, Chef. The Grand Illusion was my first concert, and I think we spent that whole summer sitting in my buddy's basement, smoking non-tobacco, and listening to The Grand Illusion, Equinox, and Crystal Ball (Pieces of Eight and Cornerstone obviously came later). Styx was my favorite band for a while, and I still have great memories of them.
But Kansas was there, too, and if we're just talking 70's, and I put the best against the best of each, the worst against the worst, and the average against the average, Kansas comes out on top.