Are there better options than PR Web out there?
teej: SEO via PR releases?  That sounds like a terrible idea.  Why don't you start a topical blog?  Spend that money to hire a subject expert to write a few blog posts for you to get you started.SEO is comprised of two things: original, relevant, fresh content and strategies to make that content visible.  Your content is the most important thing -period-.  The SEO "strategies" are tools to help Google understand your content.  If your content isn't good, it doesn't even matter what else you do.