Keyword Research Tools

I'm in the processes of buying domains for a client of mine and I'm using WordTracker and Keyword Discovery. It makes me uneasy to know if the numbers I'm reporting on are accurate. Can anyone give me some links to information on keyword search count accuracies?

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Keyword Tools

Wordtracker gets good clean counts, but it's such a small sample of searches. Keyword Discovery gets higher counts, but their data is a bit suspect.

Google's Keyword tool isn't too bad, but it doesn't give counts. I think there are tools out there that parse the green bars on Google's tool to turn them into numbers. I don't have a link though.

MSN also has a lot of cool tools as a part of their Ad Center. I haven't used them yet though.

Aaron Wall has a pretty comprehensive review of keyword research tools.