And please be aware that just because you see a number of threads about <xxxzzz> problem on <MBP,rMBP,MBA> doesn't mean that you will have an issue.
I have purchased 7 Macs since 2005, and none have had any hardware issues. I have a new rMBP and a new MBA, and there are no dead pixels, no broken ports, no slow bootup, battery is fine.
People generally don't start threads "My MBA runs great!" as frequently as they start threads about problems.