What ever you do...
DON'T go to the apple store,drop your pants, stick the laptop inbetween your legs and shout "I'm the king of the world"
I'm pretty sure that will void your warranty
Legendary advice (I am still laughing at this one).
to the OP - these guys are speaking truths - do the research, get what you need (planning to upgrade soon after is silly - best get it all from the store and be covered with the piece of mind that Apple gives you)