Hi,
Gays...
My point of view, first offal your website onpage optimization complied.
And Off page through you get page rank.And best page rank submission you first get you site page rank..
I am sure that the best solution for you is paidforumposting.com.
They offer article writing, blog commenting, and forum moderation packages as well to complement the forum posting.
Hope it will help.
To increase your site's page rank, you have to get quality back links of relevant sites, Along with it unique content and unique visitors also matters.