Down lights
Down lights
I use a variety of Compact Fluorescent downlights for commercial projects, not too much call for them on the residential side.
I wouldn't waste the money on dimming them in a residential application. You can expect to add $85 to $100 per downlight to add a dimming ballast, should be able to dim any wattage you listed.
I have used Pathway, Lightolier, Kirlin, Halo, Juno, Lithonia and others. None of them stand out as remarkably better than the others. I have used plenty of dimmable in the commercial side.
If they are insistant on dimming in residential, make sure that you coordinate the lamp and ballasts. Lutron makes a good ballast that works with the Major 3 lamp manufacturers (Sylvania, GE, Phillips). Also, I would suggest staying away from the non name brand lamps when dimming. Lastly, I wouldn't expect to be able to just walk up to the local service desk and walk out with a couple of dozen of these.
Good luck!