Ah ah, i understand you! Even if i like them a lot, i'm a quite frustrated when the protagonist can't choose one or other(s) girls!
I'm in front of my comptuer and say to my screen: " Choose her!! Stop procrastinate!!! "
But effectively, like said SieghartXx , Amagami ss is very great, there are 6 (+1) girls. Each 4 episodes, we restart with a " and if ..." and go on!
By the way, i guess you like a lot zero no tsukaima? Or even Shakugan no Shana? As i remember, "Shana" is the first manga i saw in Vosteng,( useless fact , i know )
Both of them are probably in my top 10!