I too was just looking at lights. It's starting to get dark earlier
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I talked to the guys at my lbs and they carried both Nightrider and Turbocat lights. After talking to the guys there I ended up going with the Turbocat Nightrider. I used it last night and I must say that it is great (and pretty cheep - $115)! I chose it because of a few reasons. #1 was that you could change the bulbs from floodlight to spotlight and with different wattages (5,10 or 15 watts). #2 was that it used a pretty standard battery connection and I nkow of a few guys that have taken battery packs from other utilities and use them with their lights.
I rode with a guy yesterday that has a $350 HID light and I must say that it was bright, but almost obnoxiously so, you could hardly look in the general direction of the guy. It was definately bright enough for just about anyone I'd say though.
Just my .02 about which light, the Turbocat is a great deal which can lead to more options than some other brands and it's definately bright enough for me, and it saved me a lot of money.