I think this thread should belong in uh Mobile Computing. Anyway , check out the pinned threads there , they give you a general picture

Don't tell me you're going to play Habbo Hotel ? . Habbo doesn't need that powerful graphics , even an on board graphics card from Intel would do the trick. But nevertheless , keep that graphics card option. Its better to have a dedicated rather then an on board. But jugding from what you're going to use it for , the graphics card seems to be bit of a overkill.

My advice would be skip GeForce and opt for Intel if you want more juice (aka battery life) and you don't want the laptop to be hot. A discrete graphics card may "heat up" and they don't give you a longer battery life as opposed to an IGP. Its just my advice. On the other hand , if you plan to use your laptop to watch HD Movies or plan to do light gaming or even have plans to play latest games such as GTA IV ,then its better to have that graphics card option !

Just get the Intel GMA option if thats the case. Not only it would save you the trouble but also it would be cooler

P.S Not only Dells are affected even my friend's MacBook Pro (with 8600GT) is having the the same problem. The motherboard just fails. People say that the whole GeForce 8 series for lappies is a total failure . Its better to opt for ATI or Intel in this case