SureFire all the way. Go to
www.surefire.com and order a catalog and read up on the logic of light. I have a Bombed out 6P (120 lumens), a SC1 spares carrier, a quick-release SureFire holster, and my wife has a G2 Nitrolon. These are extremely good lights, and I carry my 6P every day on my belt. I'm waiting for the 9P to come back out this summer. That light runs about $107 bucks but can be easily bombed out to 200 lumens. The 6P and G2 use two 123A 3-volt lithium lamps. The 9P uses three of these batteries. The best price I've found on these batteries is directly from surefire.com. These lights are spendy but I feel worth every penny. You get what you pay for. Since I bought my 6P, not only have I stopped using my MagLites, I have given a couple away. MagLites are too dim, have dark spots (inconsistancies) in the beam, and too big and heavy. The SureFire 6P is waaaay smaller, tougher, lighter, brighter, and just a better light. The advantage with this much firepower in a small package is that you can daily carry the light so you actually have it when you need it. The biggest problem with C and D cell MagLites is that since they are so huge and heavy, you don't carry them daily, and so you have to go get it or find it when you need it. Having a bright light with you when you need it is priceless. Mine lives on my belt next to my Leatherman Wave, Benchmade 940S knife, and Fox Labs pepper spray, Nextel phone, and lots of keys.

Yes, I have a BatMan belt.

By the way, at subzero temperatures, the alkaline batteries in MagLites die and leave you in the dark. The Lithium batteries in the SureFires will provide 100% light output at temps as low as -40 degrees. Again, you get what you pay for.
Basically, as a CTD owner, I will never own a gasoline powered full-size truck again. Likewise, as a SureFire owner, I will never own a MagLite again.