Hello everyone,
After numerous tries on day one and two, reading several posts, and taking a day of break from this craziness. I gave it another shot today and I was finally able to install OS X Mavericks! Whoot, whoot! Here's what I did, I hope it works for someone as well.
1. Download a fresh copy (make sure you don't let your MAC go to sleep while downloading)
2. Unplug anything connected in the back of your MAC (except your power cord, of course) 😉
3. Create a new profile (one with full admin rights)
4. Restart and log in with the new profile
5. Install OS X Mavericks from your Launchpad
That's it! Like I said, it worked. I have tried all sorts of attempts suggested by several folks, except for removing my extra 4 Gigs of RAM, as someone suggested in one of this thread, which would have been my next step had this not worked. Anyway, good luck!