From what I have heard. (and that is saying little) 4 Cross patterns have adjacent spokes overlapping at the head of the spoke, producing a weak point. And I hear they are a pain to repair as well. I mean the wheel should be bomb proof either way you want to go for the simpler option.

As far as I know the Alpines only come in a triple butted option 13/15/14 gauge.

Take that all with a grain of salt though, I am not familiar too much with wheel building. Only reason I know anything is I was looking at building a set of touring wheels and came up with exactly what youa re building with Alpine IIIs. Sadly my wallet will not support such an endevour right now. Which is why I am charging you a 1 grand consulting fee