Try Get Backers. Nice art, ecchi and an action comedy but I wouldn't say romance though.. If think Midou Ban and Amano Ginji are weaklings than you just have to read further because they quite awesome secrets to reveal 😀

And I also recommend Berserk and Vinland Saga. I would also recommend Tenjou Tenge but the problem with that manga is that it has quite a slow start. It starts getting really interesting after 7 vols. But definitely worth or at least I think so.

You could also try Blame!. It has quite nice art but it's a bit special. And it's sci-fi. But I think it's worth it. Only 10 vols so it shouldn't take too long to read it through.

You can also try Blade of the immortal. Manji is so great (and so is the story and the art)! ^^
Berserk is also a nice call... But lately i don´t seem to find it so fun to read anymore...
Good luck!

I tried out Xblade it's was kinda bad i felt like kicking the guy he's kind of a moron espically fall for the wrong girl. Also tried reading Aflame Inferno was kinda okay the main character was pretty strong and loved the art in there