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I think you have a good list already. A couple that can help as well would be Screaming Frog, it is a webcrawler, you could see page title issues, etc. from this.  Just judging from your list it looks like you have more than enough tools that you are using. The bigger is setting up a process and using it. Here are a couple blog posts about Website audits that might help you out. This post goes into detail of the steps, tools,etc that you would want to do a proper website audit. http://www.seomoz.org/blog/how-to-do-a-site-audit This post is good if you are trying to just do a really short quick audit of a website. http://www.distilled.net/blog/seo/how-to-do-a-5-step-site-audit/ Best of luck with getting a process in place.Gettings solids  Processes in place for all work that you do will help you with doing any client work.