Well, before Mike's post, I wanted to jump in and recommend the DVR2 as being the regulator that I and many others here successfully and happily use. But, knowing nothing of the K-tek or the other possible substitutes, I didn't want to talk out of my hat. So, now, I am comfortable in saying that you, too, are likely to happy with a DVR2. For, me, no more fried batteries and very little headlight variation with throttle.
Richard L.
Edit: Some here are still quite successful with relay-based regulators, but I could never get it set right and, perhaps I should be embarrased to say, my education is electrical engineering.