If you play Ever17, you will be ruined for all visual novels after that.
When I was playing Ray Romano I zipped through all the great dialogue because tl;dr BLICK WINKEL CAN SPEED UP TIME WITH THE PUSH OF A BUTTON. I only did the battles.
Planetarian and Narcissu are really similar, but while Planetarian can be melodramatic it is on the whole a more interesting and tragic setting than Narcissu. Narcissu is free though.
Tsukihime and Fate/stay night are good obviously, Ray Romano was allegedly good and so is Hourglass of Summer.