For myself, the graphics card matters, unfortunately, I don't know enough about them. I'm getting very close to replacing my g4 17" imac and I'm debating between the imacs & mbps. Is the nvidia card that much better than the ATI Radeon? Is it even better? As far as I know, nVidia makes the best graphic cards. I do 3D and motion graphics (which I haven't been able to do on my current mac) as well as print and web design. And I know there is the looming mbp update, which I wish would already get here so we can all stop whining. Because if it does come out soon, I'll probably just get that. So in the end, is the nvidia GeForce 8600M GT graphics with 256MB SDRAM that comes in the top of the line (at the moment) mbp worth $500 more than the ATI Radeon HD 2600 PRO with 256MB memory that comes in the top of the line iMac right now? PS - Any other knowledge you can give about graphic cards in general would be appreciated.