Steer well clear of ANY intel GPUs, they are all complete crap.
Anything from the 3800 or 4600 series of GPUs or higher will happily run most games you throw at them. When looking at nVidia mGPUs, they typically are about half as powerful as their desktop counterparts. ATI GPUs usually have the same or similar specs, only slower clock speeds.
Third rig: PC Express Invader. C2D E6400 2.13GHz, 4GB DDR2-800, 320GB HDD, Intel 945, Asus 9600GT 512MB, 550W PSU, W7 HP 64-bit.
Fourth Rig: Dell Optiplex 170L, P4 Prescott 2.8GHz, 512MB DDR266RAM, 80GB HDD, FX5200PCI 128MB, 250W PSU,XP Pro
Fifth rig (Laptop): Dell Inspiron 4000, 14.1", PIII 850MHz, 384MB RAM, 9.3GB, XP Pro. Now with passive cooling!
“I could make a better looking computer case with a bucket of Lincoln Logs.” -lemode