I'm embarrised to say this, but I have to go with Maglite my opinion says. Even with the terrible beam quality issues with the standard reflector and bulbs, at least the flashlight itself is well made and reliable. If only the Maglite body came with options for a nice Lux III, textured reflector, and HA-3 I think it would be ideal--as the fit-finish is satisfactory and all of mine have been 100 percent reliable.
I went the more expensive route with Elektrolumens in the past (literally over a dozen purchases), and had miserable results in terms of reliability (over half of them had serious issues after the intitial break-in period) and poor quality control (about 3/4 of them had fit-finish/tool marks/scratched optics/ etc problems straight out of the box). The unreliable ones have since left my hands (scrap heap), and the ones with the worst quality control problems (that still work 100 percent reliable) I've given to friends--those that work 100 percent AND have the least quality control problems I've held on to so far.
At this point, the Maglite body is at least VERY reliable and reasonably well made, and makes a good modding platform. The only other C/D flashlight that peaks some interest is the Tektite series, but they seem ridiculously high priced for what they offer my opinion says. Aside from the price, the thin laser-like optics don't really interest me on the Tektite, or the new Infiniton Lightwave lights. I don't like throw only beams. If Pelican came out with a C/D aluminum flashlight with a quality reflector along the lines of a super large PM6 reflector, I'd give it a try. Likewise, if Surefire ever expands beyond the tactical market and offers C/D I'd definitely give it a try (I've never had serious issues with a Surefire, just the occasional minor problem).
I seriously wish some companies would come out with QUALITY MADE C/D flashlights that also have good beam quality and tough finish. The C/D lights seem to be an afterthought--there is nothing out there my opinion says that fits me perfectly in C/D.