I belong to the camp that says "write the next book".
The bottom line is, it's really hard to get your very first book noticed. I wouldn't spend money on anything until you have more than one book out - just stick to the free stuff for now.
For my first couple books I got really into researching and contacting book review bloggers. I'd say for every 50 I contacted, only about 3-4 got back to me, and of that 3-4 maybe 1 or 2 actually posted a review. It was super time consuming and while it was nice to get that one review, it really didn't make a difference in sales. I don't bother doing that anymore.
My first publisher was also really into Blog Tours. I didn't really like the blog tours because it required me to do extra work on things that I felt were kind of cheesy, like character profiles and random other stuff I really didn't feel like writing (The main character's Top Ten Favorite Movies, My Top Ten Favorite Books featuring Dragons...). I felt like no one even ended up reading them and I definitely don't think it helped with sales. And now, those cheesy things I'm embarrassed by live on in the depths of the internet, forever. I have no idea how much money this publisher spent on setting up these blog tours or if they had a connection with a friend or what...They weren't very high profile blogs.
I have used free review sites like BookSprout and Reader's Favorite. It's free and I got at least a handful of reviews, so that was nice. It took up a very small amount of my time, so I plan on continuing to use these two whenever I have a new book out.