Hmm How about Ars Magica? I don't see much problems mobs are fairly easy unless you try to fight hard ones. world gen is good, compatible with NEI Thaumcraft and extra biomes. (P.S Watch Direwolf20 vids he did 2 spotlights)
http://www.minecraftforum.net/topic/1486184-ars-magica-v550006-updated-april-14/
Ars magica mod
http://www.minecraftforum.net/topic/1486184-ars-magica-v550006-updated-april-14/
Ars magica mod