I think that is what makes Spellforce special, I really enjoyed those games, the mix of RTS and Action RPG was very refreshing and new. Sure they were not perfect or very well done, but unique games always have a special place in my heart.
Considering turn based games, I will definitely try out Dominions 3 after reading this thread, it has slipped by me so far.
I can also recommend playing Master of Magic, even if you never did before or are scared of old graphics. But I played it for the first time last year, and always play a round here or there since then, its awesome, and I think the graphics are pretty, and on a netbook the low resolution is not a big problem.
One turn based game I have not seen mentioned here is Imperialism 1 and 2, I regularly play both of them, and they are just a perfect package of turn based fun. There is no fantasy in them, though, so I am not sure how relevant they are here.