The ones I prefer are these: http://www.bigappleherp.com/Big-Appl...=2&category=13
They seem to last a bit longer and spread the heat better than the others. I use both the 100w and 150w (I have two cages - one of which uses just one dome lamp, CHE, and thermostat; the other cage uses two domes and CHE's plus one thermostat).
The other ones I'll use are more for convenience factor: http://www.petco.com/product/5003/Zo...-Emitters.aspx
They work just fine, though don't seem to last quite as long and they're more expensive. There's a PetCo on my way home and I can just stop and pick some up from there as needed, so I'm paying more for the convenience of being able to do that then actually preferring the product.