Hope you enjoy your purchase.
One of the worst things people do when purchasing computers is get lost in the numbers.
This is X times as fast or this is Y times cheaper but has this, etc.
Just like anything else a computer and an OS are just tools to complete some job. The job is different for every user and often purchasers lose focus on accomplishing that job and get lost in the numbers.
For me, I traded in a Quad Core Dell XPS 420 for a 24" iMac. Sure the quad core was faster for movie encoding and such, but my overall system use isn't any slower. I've ditch the headaches of trying to dust a bulky unit under the desk and a tons of cables with a sleek simple unit that sits on my glass desk.