par,
As I had said in an earlier post, the Raja of late 70s is someone who has put his throne in every heart that heard music in those times and refuses to be dislodged from that position. I am sure there are many more posters who will resonate with what you said and will unanimously approve of all the songs that you listed. An excellent list.
Going by your list, there will some who will argue that while the poetry became better in 80s when Vairamuthu came along, the pre-Vairamuthu days were the best ones from a musical perspective. I am personally someone who loves Raja of all times, 70s to 2000s.