So many choices now. Check the
We Test Lights site, run by Light & Motion but impartial and very informative. They rate some competitors' lights better than their own, either in terms of run time per charge or value.
Best conventional wisdom? Buy more light than you need and run it on lower power. You'll get more battery run time per charge. I find 500 lumens plenty, sometimes too much unless it's on a dark two-lane rural highway with heavy tree cover. So my ideal light would be 800-1200 lumens, run on medium power, so it'll last a few hours rather than the usual 60-90 minutes on high.
Great thing about L&M and most compact lights (everything in a contained unit) is the more powerful lights aren't much bigger and heavier than the lower powered models.
But if your budget runs to $200 or more, there are some other good choices -- check the recent archives for suggestions.