Show us yer Touring Quivers!
3 is about right for me imo.
One firm/mixed snow ski that is pretty light but not too light that you waste energy trying to keep it from misbehaving. 1500-1700g
One superlight skinnier powder ski to knock out as many laps as possible. Quantity over quality. 1200-1400g
One superfat powder ski to get rowdy in deep powder. Basically make the laps as fun as possible. Quality over quantity. Can double as a big resort day and sidecountry ski. 1800-2000g
For resort, a firm snow specialty under 100mm and a 105+ daily driver thats good on normal powder days and for several days after. And then the same superfat powder ski used above, or a resort-dedicated one.