Well, my non gaming profile is 1566mhz cpu with -25μV undervolt (not necessary) , 320mhz gpu and -50μV undervolt (also not necessary).
It' ll cover all your needs, even smooth 1080p playback and recording.
Maybe you could go lower than this, I haven't tried to though...
I get around 7 hours with moderate to heavy usage using this kernel and latest Omega rom.

I can't say how much battery life you'll get if your usage is lighter than the one described above because I almost always use mine with moderate use and charge it at night, lol.

But you can expect a lot better than that I suppose...