Originally Posted by Libertine

Wordpress is quite good for SEO, if you set it up right.

As for the cost of making a script like that from scratch... you'd probably be looking at $1000 at the very minimum, depending on how closely you'd want to copy fmylife's functionality. It isn't all that complex, but post/comment/user moderation, support for multiple moderators, etc. means it's a fair bit of work. That's if you go with a decent programmer. A cheap one might do it for a few hundred bucks.