something like bleach??how about naruto shippuuden..top 10 can only vs top 10
alternatively, u could go for completed series such as "Darker than Black/Code Geass/Soul Eater"
or u can go for 07 Ghost in general (not for me though cuz too much male - male relationship)
but action wise is ok.

Recommendation for on-going animes
One piece (NAKAMA , adventure)
Canaan (Gun fight action)
Sora no manimani (School life & romance)
Pandora Heart (action, adventure,fantasy)
Bakemonogatari (unique & supernatural)
Spice & Wolf 2 (recommended for those who followed S&W)