What is the brightest bulb I can get for a 4" recessed can which doesn't exceed 50 watts?

I am trying to find a bulb, preferably dimmable, 50 watts or less to use in 4" recessed ceiling fixtures. I would like to find something that exceeds 1000 Lumens and is dimmable.
Update: To clarify, I've not found a single dimmable CFL that works nor an LED that puts out this much light, so please answer only if you have specific brand/model information. Also, dimmables must NOT buzz!
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