Hello, I am a newcomer to your website. I happen to be one of those people who have no problem with software, but when it comes to buying a new computer for my needs, I freak.
I am looking at Dell and cannot decide whether I need an i5 or i7. I download videos, movie clips, and work with PhotoShop. I need loading and running speed with no loading stops. I hope someone can help me.
i5 is the best cpu for your need.
Consider the Phenom X6/X4s also, pretty decent value.
For silky smooth PS, just make sure you have at least 4GB of RAM. Though 8GB is probably the most you'd want as more than that you'll be wasting money more or less.