I have a neutral quark 123 tactical (no clip) from the run from sometime last year, and it's a great little light.
I recently got a warm Preon 2 and spare 1 x AAA body tube. I really like the XP-G beam pattern and the tint, but am not sold on the lightweight build/style, or the clicky switch, of the Preon. Then again, I generally despise "penlights" and only was tempted by this one because of the tint, the emitter (XP-G) and, well, it's a Quark, so I knew it was going to be pretty darn good for the money. And it is. It's now one of the "house" lights, and in 1 x AAA config, is pretty much perfect for that. Put on the 2 x AAA body, and you can light up a bit more outdoors.
I'll probably grab another neutral tint Quark (but not a Preon) from the upcoming run, or perhaps another warm, either a 2 x AA tactical warm (caj use with my 1 x CR123 tube or a 1 x AA tube) or 2 x CR123 tactical neutral (still impressively bright). I'm being tempted by the Mini CR2 or 123, for the size and price-point, but I'm afraid I'll find them a lbit too lightly constructed for my taste, and so will likely pass on the Minis