One follow up question-- have you downloaded, printed out and followed along in the Installation Guide that Apple offers at the top of their
Boot Camp Support page?
It seems odd that your installation is giving you so many headaches as it is quite a smooth installation for most users, so thought there might be something being missed that the illustrated and detailed guide might point out. When it has failed have you gone back to square one by running the Boot Camp Assistant and removing the BC partition before trying again in case something is not set up right in the partition structure? I would certainly recommend you do if you have not thus far.
That is an interesting question about taking the machine to Apple too BTW. While I know that the Genius Bar people are happy to reinstall OSX for you should you lose your disks or have other problems with installing, I really wonder whether or not they will offer assistance installing software that is not Apple (i.e. Windows). I have never seen anyone resolve their BC problems that way, so it does have me curious. Be sure to post back here concerning your results if you wind up going that way so that we can make notes OK?