I used the ones with the heat sink. The headlight output was pretty crappy with the standard halogen bulbs, these are somewhat brighter, and for those of you saying the beam pattern will be screwed up, the stock pattern was garbage, so these are no worse.
I did find that with the LED's I bought the bulb part is able to rotate somewhat around the heat sink, so make sure that the bulb part is straight up and down when you install them. It's a bit of a wrestling match to get them in, so it's pretty easy to twist them up.
As I said, I went the cheap route to start, if I need to redo it, I will go with the retrofit kit that everyone is saying you should go with. For now, for me, it's fine.
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