In most retail applications the lighting engineers will specify certain brands of lighting to be used... usually Halo, Lightolier or Juno. these are name brands, premium products.. they are quality
however lighting engineers are not spending their money..
If I had a store, I would not think twice about spending the "extra" for the good stuff however...
there are some cost effective (cheaper) alternatives
You may want to check out
this company.. download their PDF catalog (about 4.7MB).. they have some cool, affordable stuff.. if you have a store, the "Flourotrack" on page 13 will probably interest you... but then it all depends on what you are trying to do.
Whatever you do.. avoid the fixtures which use the line voltage MR16 lamp