Dell should have the option of putting an Nvidia 8700m w/ 512MB VRAM into the inspirons. the 8700m is the same hardware as the 8600m just overclocked a bit and with more memory so there shouldnt be an issue with fitting it into the chassis. if battery power is the issue... then idk. ive never gamed on my laptop without first plugging it in.
or at least give Inspiron purchasers the option of a 512 video card.