Here is my first recommendation of the current season (Spring 2015).
Plastic Memories プラスティック・メモリーズ
Assuming you are already watching Fate/Stay Night Unlimited Blade Works, my top recommendation for you to watch would be, Plastic Memories プラスティック・メモリーズ. Its a very interesting anime, it has a great characters, Seiyuus, comedy, drama, intriguing story and, (warning) it would probably make you cry. Check more info for this Anime here myanimelist.
This recommendation is only based on the first 3-4 episodes of the current season, I don't read manga, visual novels or anything.