The argo HP says its 24 lumens
here, might as well get a $15 energizer, read from many sources that it is also 24 lumens.
I would buy
dealextremes P4 for $10 and just buy a better reflector for it.
If you need it to be waterproof, you could do it yourself with GOOP, sold at Walgreens/Walmart, or automotive stores(Automotive GOOP red tube).
Hardware stores also usually have O rings, I think that model will only allow you to put 1 on though, you might brake some wires if you twist the other end, I have a model headlamp that has an identical casing as it, and if you were to turn the other end it would brake a wire.
If you don't care about throw just get the
$39 P4 zebralight. I heard the Q5 isn't much brighter anyhow. It is waterproof, but only a floodlight.
The
Apex for 60$ might be your best buy if you can afford it. You might want to buy it at a store if you can, I heard the casing is often cracked and they need to be returned.
The
Blackdiamond Icon is also an awesome light for just $60, sorry for the 60's but those are the cheapest super bright ones you can get that I know of.
According to
this the Petzl Tikka is 35 Lumens (maximum), and is only $32 here, found this in googles recommendation advertising top of the page part:
http://cspoutdoors.stores.yahoo.net/tikkaheadlamp.html
Normally for around $35, I think you get about 35 Lumens. Might as well do what I did and buy 2 energizers $30 and you got 48 lumens of long lasting LED light.