Zebralight H600: 600 lumens. The standard version is better for hiking, and the floody H600f is better in camp, at home and for reading. If you want to see that bear at the tree line, you'll want the H600. Both these lights require a 18650 lithium ion battery and charger. That will put the total cost closer to $125 with shipping. They have very low light settings to minimize hurting night vision while maximizing battery life. You could probably hike for a couple weeks before needing to charge this light.
Zebralight H51: Same as above, but costs a bit less, uses any type of AA battery and only puts out around 200 lumens. That's still a lot of light though.
Trustfire Z2: Puts out around 250 lumens, but only costs $14 shipped. It has a beam that's better suited to hiking than reading. Supposedly it can use AA batteries, but you'll probably want to go for a 14500 lithium ion battery. The cost of adding a battery and charger will bring you to around $25. This light also weighs less and is more compact than the Zebralights. Unfortunately the low setting isn't as low, so some night blindness will occur, and maximum battery life isn't nearly as long. Oh yeah, it doesn't come with a headband. That'll be about $3 more. The button isn't recessed, so it may accidentally turn on in your pack
Ultrafire H3: I don't know as much about this light. It's around $30. I believe it puts out a little more light than the Z2 and has a beam pattern that's not quite floody, but not quite ideal for hiking either. Like the H600, it uses a 18650 lithium ion battery, so you'll have to spend a little more for a charger and battery. It has PWM modulation on all modes, so if you're sensitive to lights that flash at rates that aren't supposed to be perceivable, then this isn't the light for you. It also lacks a very low low, so maximum battery life is limited. The button isn't recessed, so it may accidentally turn on in your pack.
As with almost every light, these are made in China. For $100, you're probably going to get a light made in China.
There are the cheap plastic lights like the Tikka. I don't see why though. They weigh the same or more than the lights above, put out less light, have less battery life than the Zebralights, and aren't the cheapest options either. Oh, and by cheap, I mean not good. It does nothing very well except get on REI's shelves.