I'm kind of a light whore when it comes to my motorcycle. I have HIDs installed, two ADVmonster model 30 fork-mounted LED spot lights, a single ADVmonster model 60 LED light mounted above my headlights, plus additional rear lighting on my side cases.
I'm very happy with my ADVmonster lights. I've seen the Denali lights in person at the BMW International Rally in Oregon this year at Twisted Throttle's tent. They're really well put-together lights, and looked really bright (in the daylight). But, my ADVmonsters are a fraction of the cost, well-made (admittedly, not as much as the Denalis), and looked to be every bit as bright.
Advmonster link
If you're going to do auxiliary lighting, you've got to first figure out what you want from your lights. Do you just want drivers to see you better? Do you want to extend your low beams out a little bit? Or do you want some mega-lights that are high-beam only?
If you want to extend your low beams, upgrading your lights to HID or replacing the wiring and adding a relay are good options. Or you could look for an auxiliary light with a tight pattern that you can aim lower so that you're not blinding oncoming traffic. My model 30s are a tight spot pattern, but I still had to aim them a bit lower than I had originally intended to in order not to blind people... and they're still right on the borderline of being too bright. I have them on their own switch so that I can turn them off if I'm in town at night where I don't need them. They always stay on during the daytime for added visibility, and it is a night and day difference after getting them in terms of drivers not seeing me.
If you want a massive light for burning the retinas out of any forest rats or opossums unlucky enough to be in your path, than a good flood pattern high-lumen auxiliary light is what you're looking for. That is what my model 60 is for. It is tied into the high beam circuit with a relay, so when my highs are on, the auxiliary light is on. It is 3600 lumens (though to be fair, I don't think the lumen ratings used by Denali and Advmonster are the same scale), and pointed straight out front. It is absolutely blinding and not to be used with oncoming traffic. It does a phenomenal job of lighting the road though.
I'll dig up my post on advrider.com after mounting my model 30 and repost it here... Oh, and speaking of advrider, Advmonster gives a decent discount on their lights if you're an advrider forum member.
Also, I wouldn't buy from BKMoto. He stole pictures from a member here using a different setup and claimed them as his own without the member's permission. He then didn't reply to emails about the matter. Bad business practice IMO. If you search you may find the thread. I can't remember which subforum it was in now.