I have 2 Dinotte 400L light for 800 lumens of light. It's a traditional flashlight kind of beam. It cost about $500, plus I usually also have a Dinotte 200L light on my helmet ($100 plus batteries). It works alright.

I have a Lumotec Cyo front light on my winter bike. It's a shaped beam that puts an even spread of light on the road - it puts out more light at the top, but since the top is farther out on the road the road is evenly lit closer to me and farther away from me. The light cost $120 or so, my bike came with a generator hub which would cost about $200 with a wheel. I usually ride with the same helmet light on my helmet - $100 plus batteries and charger.

Despite costing about half as much and being rated at half as many lumens, I prefer the Cyo and helmet light combination over the Dinotte light setup. My only complaint about the Cyo is that I'd like somewhat more light to the sides, but the helmet light does that job. The Cyo does a better job of lighting up the road. My best attempt at an explanation is that the Dinotte's irregular light distribution causes my eyes to adjust to more light and I can't see off into the dark as well, whereas my Cyo's even distribution doesn't.

If you don't have or don't want a dynamo hub, I know Lumotec (aka Busch and Mueller) also sells battery powered versions of their light with similar or identical optics (shaped beam).

If you're cheaper, the Ixon IQ is around $100:
http://www.bumm.de/index-e.html

They also have a more expensive version called the Ixom IQ speed for $250:
http://www.bumm.de/index-e.html

I know Peter White sells them through his website:
http://www.peterwhitecycles.com/b&m.asp

If I was buying more lights, personally I'd try those.