I haven't played Clannad but it relly seems like good novel, since the anime is great. I also heard that there is a vn featuring only Tomoyo's story. It's called "Tomoyo's After", or smth like that. So maybe it can interest you, if you liked Tomoyo's route
I used to play F/SN. It's good vn with nice story and art, but it seemed for me a bit stretched. So I've read only one route and then stopped. Maybe I'll continue playing two other routes somewhen.
And currently I'm playing "G-Senjou no Maou". Kinda enjoyable. The plot is good. I guess it can be liked by anyone who likes intense stories or suspense genre. I can say about it something like: "This is an example of how Battle of Wits should be implemented".
@ban
By e-vn you mean VNs with h-scenes I guess?) Or nukige-type? oO
Yup, I've read Narcissus too, and it's really awesome. Though I liked 1st part more than the "Side 2nd". Even shed a tear a bit in the end, lol
I'm planning on Ever17 but... Well, there are so many VNs in my plans XD
Hard to choose but for now my favorite is "True Remembrance", I think. It's doujin and maybe the art style isn't very good, but it's a really great novel. The story is touching and the whole atmosphere of this VN is kinda fascinating. I like it a lot.