How much memory do I need in my new laptop?
I don’t think you will see much difference between 3 GB or 4 GB RAM. The difference between 250 GB and 320 GB isn’t very large either. I think I’d still get the notebook for $650. It is unlikely that you’ll be able to upgrade RAM and hard drive for less than $100 at some point in the future, should you decide you need to do that.