Yeah, I gotta agree, that's kinda asking a lot and narrows your choices. REI comes to mind. But living on an island with minimal boot selection to try on, I feel your pain. I was once told by an experienced climber that if a mountaineering boot isn't immediately comfortable, it likely won't become comfortable enough to wear in that situation. Meaning, there's not much break-in to be had and it's not a pair of light hikers where you can put some moleskin and cover up a seam or thread line. If the boot isn't comfortable in your living room, it won't be on the mountain. If the boot is comfy on carpet, get on some stairs and do one-leg calf raises. If the boot moves in any direction or you've got heel lift, try to adjust the boot and do it again. If you can't adjust it in a couple of trys, the boot doesn't fit. Of course the proof is in the pudding, but it's held true for me for many years of mountaineering boots. I've never returned a boot I wore outside. I just returned two pairs of Sportivas after ordering three. The pair I kept have been good so far in the light hikes I've been able to do, and I expect them to keep on working.