Have you considered the Battery Adapter PRO from BoxWave ?
It's only 22.50 (Web Special at the moment) and has the advantage of using rechargable or normal batteries. This gives you the flexability of being able to recharge even when there are no power plugs handy !
This has been an invaluable tool for me. Check it out at
http://www.boxwave.com/products/batt...pter/index.htm