I'll be buying my first MAC (PB 15'' or ibook intel...) next week after MWSF. I'm wondering if it is worthed to buy it from the store instead online. I'll be paying tax (8%) but in the other hand I can actually check the machine before buying it (screen, RAM slots, battery, etc). SO I ASK: 1-Do they let you check the machine before paying for it or you must get a closed box... 2-I'll put as much RAM as possible. Do they put it in the store? I mean: Do I have necessarely to buy it online if I want a costumized product? THANK YOU!