Maybe this is a search for the Holy Grail? Ideally I would like a tool like the one on shown on the Adwords Accelerator site. (www.adwordaccelerator.com) Something more for finding suitable but very cheap keywords.
I've been using the AWEditor software for a week or so. Great efficient interface for some work, other tasks are better in the web UI. I've been toggling and cutting/pasting back and forth a lot in new campaign creation. It's good stuff. Charlie Seven87.com