CREE.

You can go with either the LR6 or CR6 for 6" cans.

David

Renaissance Lighting has the best combination of features and performance, including dimming, of any fixture I've seen. This is a premium product and priced accordingly. The optics are intended to cut off the beam for low glare and to direct the light.

Also look at the new Juno Aculux as they now have LED. LED will be coming to Cooper IRIS soon too.

Here is a link that might be useful: Renaissance

I second the CREE recommendation. Best diodes with the best price.
If you want something high end, Tech Lighting's Element LED is a very slick system priced lower than comparable products.

Here is a link that might be useful: Element Recessed Lights

I know this is an oldie but we are doing a kitchen remodel and need answers to this same question. I guess things have changed in 2 years.