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Before you buy anything, see if the free, official MySQL's GUI tools (specifically the MySQL Query Browser) will work for you.
Personally, I'm fairly comfortable interacting with MySQL's command line interface and haven't used their GUI tools very much, but I just downloaded Query Browser and it seems like it does exactly what you're looking for.
Also, check out "Building Queries Visually in MySQL Query Browser" for a nice tour of MySQL Query Browser.