The only way I imagine myself starting diablo 3, would be an item score tool.
You give the tool a scale for each attribute, for example 7 for strength 5 for stamina and 20 for @res.
So an item with 100 strenght 100 stamina and 100 @ res would have 3200 item score
While an item with 200 strength 80 stamina and 60 @ res would have 3000 item score.
You should be able to edit scales and the item score would be displayed when you mouseover an item in AH.
If you would like such a tool developed please raise your support and someone might eventually make it.