I prefer the Lamina devices myself. Outrageously flat and an electrically insulated backing of pretty decent size.
I noticed that the 10mm LEDs have evolved into ones with HUGE ratings. I ordered some off a guy on eBay with a 150,000mcd rating over 30 degress! I mean, holy crap! They use multiple dies in the package, which precludes a tight focus. I'm still waiting, they came from China so it's expected to take awhile. I only paid $5.62 for 5 of them though.