"Roth 401k
Top google search site looks to be surpassable."
The top result is
www.Roth401k.com, an established website with the best possible domain name for that search. You wonty be surpassing him easily.
In my opionion if this is your first website you should stay away from anything finacial related. These are no longer niches cause everyone and their mother already has made a finacial website. You guys should be thinking of original ideas. The tipping website is the only decent one mentioned in this thread. Follow his lead and think of something new. THere are millions of web users so no matter what you choose as you will always get someone to come to the site.