I am loving the K2 Thraxis boot this year...very stiff, almost feels like walking around in ski boots. The nice thing is I can dial them in as tight or as loose as I want with the triple boa depending on how I feel. I usually ride with the liner boa fairly tight and the rest of the boot very loose. The reason I bought them was because I strained my achilles just before the season started and wanted really good support. No problems at all with my ankle and I have 10 days of riding on the boots so far.
They come with decent looking insoles with Harshmellow. I just changed out to some red Superfeet insoles and they seem a tiny bit better for me, but the difference wasn't huge.
I would put the K2 Thraxis and UFO on your list of boots to look at.