i'm using an external CRT and can go all the way up to 1600 x 1024, but i believe the limit is the monitor itself, not the GPU. afaik if the screen is capable of displaying it, it should work. i could be wrong though.
i emailed portableone, and they told me that the battery life of the A8Js is slightly shorter than the A8Jm due to the extra voltage of the Core 2 Duo. my A8Jm gets around 3 hours of light use, if that helps at all.
get a better warranty, with Dell's tech support you won't regret it. at least 2 years with complete care would be a worthwhile investment. the Dell forums here are full of people who have been more than happy with Dell taking care of...