I have no experience with the 105 double or 6600 triple, but my 6703 triple (52/39/30) has a ton of chain noise on the 39T ring. I have talked with others who don't really care for the 6703 triple either. Maybe the 6600 is better, but I think I'd rather have a compact to be honest.

The whole reason I'm swapping out my triple for a standard 53/39 double is because I am beyond annoyed at the chain noise on the 39 ring.

Plus I never use the granny ring anyway. There are times I am tempted to (which is why I've considered locking out the granny) but it is only a temptation because it is there.

Granted there aren't any really long grades around here, but I'm comfortable (if a bit slow) on the 39 ring even on the steep hills.

So something to consider if you were looking at any 6703 triples. I would avoid it.