I use a PB superflash in back and a PB blaze 2 watt in front. The blaze is great, especially if you need to actually see the road on your ride. The only thing I don't like about the superflash is it craps out if you ride multiple days in the rain and it doesn't have a chance to dry out. Though when it does dry out it works again. You can find good deals on both on ebay.
But if you want something comparable to the knog, this?
