I FEEL YOUR PAIN.
My first ever Apple Mac purchase was the new 17" MBP.
After the delay of pre-ordering it I finally received it in February.
1st MBP: faulty GPU (vertical lines issue)
2nd MBP: RAM issues (kept on beeping all the time)
3rd MBP: really loud fans (can be heard from a feet away even when system is idle), and the space between lid on the side is quite big.
Will hopefully have my next replacement soon... maybe I'll be 4th time lucky?
Now THAT'S incredibly unlucky. From passive reading, it sounds like a lot of people are having various issues with the 17" model. Here's hoping the fourth time's a charm for you.