The best:
Metalsub
Tillytec
Green force
Salvo
If you buy one of these, you won't go wrong because
1) They build only divelights
2)They have great customer service
If i were you, i would choose a led model.
The new 12 watt can light from salvo seems bright. There is a thread on this forum that speak about that light
The led 500-750 or 1000 from tillytec is very bright with good penetration. The led 1000 is as powerfull as a 18 watt hid. But if you live in the U.S, it's gonna be expensive because the euro is very high.