Dungeon ni Deai... this one have battles and ecchi, I think it's a good one
High school of the dead... zombie apocalipse and a LOT of ecchi... be careful with this one
High school DxD... be twice as careful... I mean... a LOT of ecchi with battles... perfect LUL
Freezing... I dont like of this one but maybe you can like it... who knows
Hagure Yuusha no Aesthetica... the MC is OP and this one have some ecchi too... 7/10
IS: Infinite Stratos.. If you like ecchi can be a nice one but for me isnt because of the cliche... but this one did a lot of succes with the harem style, a good point...
Prison School.. this one have ecchi but isnt a shounen.
Zero no Tsukaima.. I dont like it, cause it have a lot of cliche for me, but maybe you can like it... who knows... and I reaaly hate the tsundere heroin of this one.
Saijaku Muhai no Bahamut... For me is a good anime... neither great nor bad