For AA lights, I think the Nitecore Defender Infinity and the Liteflux LF5XT are the best ones out there at the moment. The NDI has a very elegant interface, and just feels great in the hand. It has deep options if you want it to, or you can just ignore them.
The LF5XT is my current favorite flashlight, by far. Very high build quality, latest LED technology, great runtimes, but the real draw is the interface. Not only can you program the brightess and type (continuous, SOS, strobe, etc.) of the five available settings, you can set it to have as many settings as you want. If you want a single level light, you can have it. If you want a low low, a high high, and a strobe, you can do that. Whatever you want, you can program in, and programming really isn't as bad as some make it out to be. If you can follow basic instructions, you can program the light.
I got the EX10 the day it came out and promptly sold it since the UI just
didn't do it for me. I'm not saying it wasn't a great light, I just think there are better options. I do love my EdgeTac (Nitecore and Raidfire parent company) products though, so I am excited to see what they do next.
For headlamps, there are not many Chinese manufacturers pushing the envelope. Zebralight makes some cool products, but they are pure flood lights, which does not appeal to me all that much. Fenix supposedly has a headlamp coming out, but they have been saying that for a couple of years now. The best headlamps out there are coming from the traditional headlamp guys, and some of them are right up there with the Chinese companies in terms of technology.
Coleman has a little mini CREE headlamp (up to 70 lumens) that runs on CR2 batteries that I absolutely love. It has multiple levels, is light and tiny, and is bright as ones 10x its size and weight. The low level is not super low though, so I have heard some people say that it is TOO bright. Coleman is not traditionally associated with quality, but their new Exponent line is impressive, surpassing a lot of the established brands.
If you want more runtime, Petzl has some great headlamps in their Myo line. Their current Myo XP (up to 150 lumens, 80 realistically) is what I use in conjunction with the Coleman. It has multiple levels and fantastic runtime with 3xAA batteries. The best feature is a flip up diffuser, so you can switch from flood to throw without having to use crappy 5mm LEDs as the flood solution like most other manufacturers do. There is a consumer advisory out on them right now since a few have melted wires while using rechargeable batteries, so heads up on that. That said, I have used Eneloops exclusively in mine with no problems.
Petzl has a new model coming out next year, the Myo RXP. It is basically the same as the XP, but you can program the brightness levels on each setting, which is some pretty awesome technology coming from a giant corporation.