Having worked at Microsoft for years, I also got a chance to work directly with Monotype on custom fonts for a project's specific needs (wearable, tiny screen, specific DPI).
Monotype is amazing to work with. And given the amount of work they did, and what we got out of it, the price was absurdly reasonable.
For your blog? Use a free font.
But if you need a custom font, you really do need a custom font, and Monotype is #1 in the industry for a good reason.