I just checked Tempester's wall. I'm a bit disappointed you didn't also ask me to try to sell you on Love Live!, since I even have it now listed an all-time favorite on my wall.
How far into Love Live! Season 1 did you get?
Anyway, I'd say that Love Live! has a great blend of drama and lighthearted comedy, somewhat comparable to Tari Tari. It's just that, like a Key work, most of the drama takes awhile to build up. Season 1 Episode 8 has a fair bit of drama to it that you might like.
Love Live! also has some very nice idol performances, in my opinion. Ones that look much better to me than what I can recall seeing in Idolmaster and WUG!