Hello: I am confused as to which MBP 15" model to buy... the base 2.4 GHz or the faster, more expensive 2.5 GHz. I'm not a gamer and don't expect to be watching too many DVDs on the MBP, but I do hope to use Aperture and perhaps Photoshop to organize and edit digital photographs. I do intend to upgrade to 4 GB of RAM and the 7200 rpm drive. Now to the question... Do I need the 512 MB NVIDIA of the 2.5 GHz MBP, or will the 256 MB NVIDIA of the 2.4 GHz version suffice? I don't want to spend an extra $500 but I don't want to regret buying the less powerful version. Many thanks.