You may want to clarify what you need to get input that will be useful to you.
If you want a custom built steel frame, I would suggest checking out Rich Adams, who is co-owner of the LBS I use:
http://bicycleframes.com/
I have never ridden one, but I have seen a few. They are sweet!
If you want to spend more, you surely can... Another sweet looking and popular custom frame is:
http://www.vanillabicycles.com/
I am sure there are many others as well.
If you are talking standard off the shelf frames, the answer will be different.
Road, track, mountain or other?
What price range are you seeking?
What material(s) would you consider?
Is quality to you a nice ride with good looks and durability, or do you mean race worthy as well? Or something else?