I have reviewed several threads regarding optics 1-4x to 1-8 power. My budget is 2K to 2500 max. I would like to mount this optic on an MR556 for use for 3 gun and general sport shooting. I want an optic with genuine 1x power on the low end. From my reading I'd prefer a FFP with a large bold circle like reticle. Day light illuminated washout is not as important to me as long as the black bold reticle is still identifiable quickly in daylight. Below are several options I have considered so far. Any first hand experience is much appreciated.

Leupold Mark 6 1-6
Nightforce NXS 1-4x24mm
Kahles K16i 1-6x24
Trijicon AccuPower 1-8x28
Swarovski Z8i 1-8x24

I am open to other suggestions as well.

Thanks for any help,
Chris