@rnc -
First off, with that type of competition, I wouldn't get your hopes up of any kind of domination at all. If you really work your ass off for it, maybe several months down the road you may start to see some results, but this will take daily promotion, lots of quality content(not a single page site), and a lot of patience.
Why would you count social bookmarking out of the question? Without SB, you will hinder your chance of making any progress that much more.
You say that the highest you got in Google is page 5...then why are you targeting a keyword with that much competition?? You would do much better to target a long tail keyword with less competition, get that ranked, and then work your way up from there.