Improving your Blog's PR

I've been thinking of getting a consult from a SEO specialist for my three blogs. I've been doing a lot of thinking as I am already in the process of collecting payments from my blogging gigs and I was thinking of allocating some of my PayPal funds towards the services of a SEO expert. I'm not sure if what I'll be doing will be well worth it, but I really want to increase my blog's PR so that I'll be able to land more high-paying blogging jobs in the near future. I guess what I really need to do for the meantime would be to research a good SEO company so that my hard-earned blogging money will not go to waste.

What do you guys think?