I went with Pelican before ghost came out to get off of Wordpress. I was tired of the constant security updates enough to try and migrate to something else. My first requirement was that it was able to import Wordpress content which Pelican had.
However, Pelican's wordpress importer was "bare-bones" to say the least and still is. I fixed it so that it at least preserves formatting (by translating Wordpress' insane parser thing for its own post format line by line). It won't preserve things like image links and stuff (or at least I didn't get to that part).
I'm still not a huge fan of it one way or the other but it does its job I guess. Development is fast and furious though and I haven't updated in forever. So ymmv there.
As for Ghost... same problems as Wordpress and harder to self-host by orders of magnitude. It has a catchy admin interface. Designers love this platform so finding a good template is pretty easy compared to Pelican (I had to write my own... again not as much fun as it sounds).
The bonus of both platforms is that they both parse markdown for post content so dipping your toes in and trying something else shouldn't be too painful.
Update: fixed an unclear anaphora.
I also run a web service on a LAMP stack. Initially I thought about using Ghost for blogging but due to complexity and lack of information on running Apache with SSL and Nodejs on same server decided to wait.
Personally I've just moved to Ghost and I have to say that I love it. I wrote a longish post [1] on all the blogging platforms I've tried and how Ghost compares. The post also explains why I didn't go with something like Jekyll. Check it out, it might help.
[1] http://mehdi.me/ghost-io-the-first-blogging-platform-that-ma...