oh, i would go hkek all the way. the 6700 has a better rear changer (sram x9), imo. other than that, the spec sheet is identical. (i am on a very old laptop right now so cannot go to the links you give above, it would be very troublesome, but sort of remember the spec sheets, so i might be wrong, but i think other than the drive train the spec sheet is identical). the hkek has a better frame. also it has more travel already.

the genesis geometry basically allows you to stretch more on the bike. i kinda dig that. when i bought my bike i really had no idea about stuff, and well, when i started i found my 6500 frame (same as the 6700) to be too stretched, but now as i am getting used to the bike, i am finding myself wanting more space to stretch out and go flatter over the bars if you know what i mean. the genesis geometery allows that naturally without swapping stems and yadayada, so personally for me if i had to go all over again, id go with a gary fisher. and then plus the better zr9000 frame and the 20 mm extra travel.

man if both frames feel alright to you, then go for the hkek for sure!