Thank you very kindly, Danny and Viper.  I'm down to two lenses to choose from now.  Hopefully I'll come up with a choice before Christmas so I'll have time to practice before next spring, when I am hoping to be able to vacation abroad, if all goes well.  I think I should be able to rent the lenses at one of the better shops in the city.  Thanks very much for your opinions.  I appreciate it.

Maria