I have core 4 element and really like them. Join camofire, and get daily emails on stuff they are selling that day for good discounts.
I bought 2 merino 1/4 zip 190's for $84.00. They had crew top camo 190 merino tops this morning for $55.00.
I have mostly KUIU because I got it on sale. I also have a smartwool top and a ice breaker top. I prefer KUIU and FirstLite as you support hunting companies but sometimes the deals are too good to pass up.
I really like my Smartwool and KUIU. From what I have seen the Kuiu runs a bit smaller in size than the firstlite. As in a Firstlite large is big enough for me but the Kuiu and Smartwool i tend to stick with a extra large, just something to keep in mind if you plan on ordering.