Actual runtime on rechargeable 123s (Quark 123 X)

I'm new to flashlights. I must say I'm incredibly amazed of the enthusiasm you guys have for flashlights on this forum. Kudos! Anyways, I'm trying to make my decision between Quark X 123 or AA.The Quark "X" 123 has a runtime of 1.7 hours on 2-CR123A batteries on max setting--but under what capacity?Also, if I was using the AW RCR123A 750mah that is selling on 4sevens.com, how much would the runtime be for all modes on the Quark "X" 123? Are there higher capacity rechargeable 123s?Thank you. And a big thumbs-up to all the scientific reviews, detailed graphs, and picture comparisons. Hardcore.

There are about 4 different reviews with testing here on CPF. Try this one for run times :

http://www.candlepowerforums.com/vb/showthread.php?321813-4sevens-Quark-X-123-2-Review