I always wanted to try the Summon Knight games, but never seen a copy out in the wild. I mostly remember it from write ups in Nintendo Power and word of mouth from the gaiaonline forums. Apparently the game was pretty gay for a game released in the early 2000s (at least if you played as the female protag)
I definitely enjoyed Sword of Mana, though it definitely felt unpolished compared to what Square was putting out in those days. I just remember the OST hitting pretty hard, and me holding the GBA up to my ear to jam to the songs.