Although I don't run, I own a modified P4 Princeton Tec Apex that I absolutely love and would suggest that you consider the Apex Extreme
With the remote battery pack, you won't have the battery pack on your head, and with 8AA's you'll have plenty of run time. If I needed to 'justify' a new headlight, I'd likely purchase this one even knowing I'd need to install the P4. Don't bother looking for specs on the Princeton Tec website, its way out dated.
http://www.brightguy.com/products/Princeton_Tec_APEX_Extreme.php#
Only $79.95 from brightguy!
This gets my vote. Be sure to do a quick check on runtime on high per cost of battery to make sure it works for you.
I use the 2x 123 version of this headlamp, as I mentioned earlier in the post. Only runtime of mine prevented me from recommending it to you.
You will like (but check cost per hour on high first)