I put these little cans in over my kitchen sink last year and just threw some halogen R20s in them. One of them burned out so now I have an excuse to get some fancy pants new LED bulbs to replace them. I really like the light placement and light level when I'm doing the dishes or whatever, so I'm just going to get some LED bulbs that are about the same lumens and color temperature.
I've got a couple more LED bulbs in some pendants over my peninsula and love them, so we'll see how these turn out. If I like them I have a few retrofit kits to pick up for my kid's room because his lights are on all the time.
Anyway I think I'm going to put some of these in. Philips Lighting 42613-0. Platt has them on sale right now for $22 each and if I go in and bat my eyelashes just right I can probably get them down to under $20.