The design of the cairn of # 40 is by far my prefered one, I like it very much : the shape of the cairn is nice and realistic, the fact that the cairn extends out of the square frame may symbolizes "outdoor", the 2 colors are more attractive than a global unicolor design.
For the font, I liked the original one (for .com I prefer the dot at the bottom as .com is oriented outside) but now I prefer the #40 one as it makes the global design lighter (less massive) and the name much easier to read (that's really important), especially if you look at it from quite far away (as it will be the case on stickers, T shirts...) or if you look at it when it is small (as on a smartphone, an Iphone, on facebook...). Maybe the same font could be squeezed a little bit, so the name would be a little less large for the same high.