Picky, picky, picky. You are as bad as me Enderet. But akg980, there's nothing like a SAGER, at least not in its price range. Face it, they can only stuff so much power in a battery, a machine with a given level of performance is going to use a given amount of power. Where the two meet is pretty much a set point. The CPU is maybe 1/2 to 2/3 of the power drain in a high performance machine. No matter what, the best you can do is cut that by maybe half. So the SAGER 4780 burns 90 watts, perhaps 50 to 60 of that is the CPU, the best you are going to do with that kind of processing power is cut that in half, down to 25 or 30 watts, so your total is still going to be around 60 watts and you could get 50% more battery life. At the SAGER's 60 minutes under stress, that's another 30 minutes, at its 120 minutes cruising, another 60 minutes. Them's the facts and there's no way around it.
You might want to look at the various AMD 64 powered machines, the ones with the 128 MB ATI 9600 video systems like the VooDoo M855 or the Hypersonic AX6, those are about the best you will do. They will have lots and lots of power, some proofing for 64-bit future, and they are relatively less juice hungry, as noted above you might get an extra 30 minutes of battery life.