I currently have a 24" iMac with 2.4GHz. I have decided to get a MacBook Pro 13" with an external monitor. I now need to decide between the two 13" MacBook Pros... Would the basic 2.26GHz MacBook be enough for me or would it be too much of a difference switching from a 2.4GHz iMac? I use it for essays, web browsing, emails, music and light photoshop work. Thanks for your advice.