The Raptor is not a bad bit of kit if you're on a budget, but in terms of output it's somewhat lacking by today's standards. Similarly, I found the beam remarkably tight, with not much spill - relatively useful if you want to see things that are in the middle-distance, but the spill around your feet isn't up to much.
I had some comparison shots from a while back, which I'll try and dig out.
The two that spring to mind would be the Stenlight and the Scurion. Both are more expensive than the Raptor, but the Scurion is eye-wateringly expensive (and very bright).
I use a Stenlight, which seems to be one of the more popular choices as the price is not ridiculous, yet it's still capable of a very decent output (420 lumens iirc). The advantage of the Sten is its relatively compact size and it can be entirely helmet mounted without you realising it's there.
I've not seem many Scurions about, but it's larger than the Stenlight and there's an endless debate about whether or not the lens needs some sort of protective bezel. It's probably the brightest commercially produced headlamp you can buy, but you certainly do pay for that!
Then there's the Viper - I'll admit to not knowing much about it, but a search of the interweb should bring up various specifications. The one thing to note is that the battery is hard to change underground and a spare is certainly not cheap!
Of the above, my - possibly biased - opinion is that the Stenlight offers the best combination of price / light output for most users. I've used one for about two years with no issues and I've not yet felt it's not got enough power for what I actually use it for.
Coming down from that price, there's not a lot to compete with the Raptor if you're going to completely overlook the likes of the Petzl Duo and similar lights.
I suspect that if you're willing to trade a bit of the traditional design that the Raptor employs, you'll be able to get your hands on something that emits more light at a lower price. There will, no doubt, be howls of protest about durability, but all I'd suggest is that you learn not to repeatedly smash your head on the ceiling ;)
At risk of being seen to publicise something that I sell ( ::) ), the Fenix HP20 looks to be a very useful bit of kit - for £80, it's got a remote battery, is IPX8 waterproof (2m) and puts out 230 lumens.
Then there are the homebrew lamps, but I'll leave someone else to cover that...
Hello again darkness, my old friend...