Pentax used to make a 200mm Macro lens that was arguably one of the best Macro lenses ever made. If you can find one on ebay or someplace you have found photographic gold. If not, there are no bad macro lenses. The rule of thumb is that if you want to shoot skitish insects you will probably want a focal length in the 180-200mm area, With flowers 75-100 works fine and for static product type shots even 50-60mm will work well. The longer the focal length ususally means more weight and more money. This is not set in stone but generally suggested focal lengths.
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