This charger from DX will charge CR123A lithium batteries with easy modification.
http://www.dealextreme.com/details.dx/sku.1251
Details for applying mods are on the page. If your going to purchase a flashlight you should just go ahead and purchase one of the new P7 or MC-E flashlights using 18650 batteries from DX. I purchased an Aurora AK-P7-5, Trustfire 2500mA 18650 batteries, a flashlight bike clip, and the charger above. High mode is actually too bright in traffic. Medium mode provides plenty of light without too much blinding of traffic. Low mode is good enough and prevents blinding of others as well as providing more than 5 hours of burn time on a single battery.