Welcome! This link is a great source for species orchids. The perfume icon tells you which ones are fragrant or in some cases smelly!
http://www.orchidspecies.com/
If you are new to orchids, depending on location probably the first fragrant orchids you will see are Cattleyas and their hybrids. Some Phalaenopsis hybrids are also fragrant (though those can be expensive).
Let us know where you are and we can make recommendations.
