What Steps do I take to recover a site from Panda/Penguin circa 2011?

I have a website that I haven't done much of anything with since Panda hit in April 2011. It was hit then and hit again in October 2011 when Penguin hit.

At the time I just got busy building other sites and didn't stay focused with this one. This one was (and still is) my most profitable, but I'm currently not sure how to dig it out of its penalty position.

It is a quality site and has all original content, but I bought a couple/few backlinking packages here on the forum in late 2010 and early 2011 and the next thing I knew - bye bye rankings.

The Facebook page is on Google's first page, but the site itself is not even in the first ten pages for the main keyword. I have some serious work to do.

I know to continue adding good quality content and good, natural, manual backlinks, but how do I begin to look for what the problem was that caused the penalty, and remove bad links?

What tools can I use to find all the site's links and which ones do I want to get rid of? I mean, I know some of the more obvious ones, but what 'else' should I look for? I hear of people doing this (where I didn't over a year ago, which is why I was kind of giving up on it). All the advise then seemed to be 'just add more good quality content'. But I want to undo the penalty altogether!

What else besides Google disavaow could I use? Or is there a really reputable SEO service that does exactly this, that you would recommend?

The website is an html site and I am in the process of rebuilding it with WordPress. I think that might help.

I seriously want to get this website back in the running again. So I appreciate all the suggestions and help you can offer.

Thanks you.