The possibilities are infinite. You need to narrow things down before you can pick a light or even get a useful recommendation.

How fast do you want to go? do you want to see the ground well? Do you need to see small things that may give you a flat? This helps determine the brightness.

How long do you need the light to run, including extra time for repairs on the road and very cold weather?
This determines battery capacity and type of light, this changes the price.

What is you budget goal? Is it approiximate or an absolute limit?

Now you can start narrowing things down. Now you can see if your budget is appropriate.