I am looking at the same decision (ordering a new HP laptop). It will be an i5-450 and I am maxing it out to 8G memory. I'm not a gamer. It will primarily be used for internet, Word, Excel and Access, however, I know from experience to beef up capacity to handle future software releases. My graphics card choices are:
Intel HD Graphics
512MB ATI Mobility Radeon HD 5470 switchable graphics
1G ATI Mobility Radeon HD 5650 switchable graphics
The Intel HD Graphics are actually the integrated one ..so they are going to use a part of ram as shared memory.
So get the ati cards as they are dedicated one and are way better than any igp available .
get the 1G ATI Mobility Radeon HD 5650 switchable graphics system it is better than the other two specified above.