i dont really understand the specific specs of computers. how is 4 GB ram different from 8 GB ram and what difference does it make? i think 320 GB is how much memory you can have but does it make a big diff if you have 500 GB instead of 320? would it make the computer run faster? i mostly surf the web and do school stuff. is it worth upgrading once you already have the computer?
The amount of RAM determines how many applications (programs) you can run simultaneously.
The Hard Drive size (320GB in your case) determines how many files you can store on your computer (i.e. documents, music, pictures, video, etc..).
That being said, having 8GB RAM and/or 500GB Hard Drive will not give you boost in speed/performance unless you're stressing their capacity.
From what you've described, 4GB of RAM and 320GB Hard Drive is more than enough for you.
Just as an example, on 320GB Hard Drive you can store:
over 600,000-1,000,000 Documents (In MS Office or iWork format, depending on size)
or
over 40,000 Highest quality MP3s (at 320Kbps)
or
over 30,000 High quality photos (at 10 megapixels)
or
approx. 70hrs of High quality video (720p HD, in H.264)
Hope that helps
