For me my working rod for cutts is a 5 wt (though that is the rod that I used just avout everything). The issue is less what will handle the cutts (anything in the 3 to 5 wt is the ticket) but rather the water to be fished, likleyhood of wind, and whether salmon are expected to be enounted frequently.

For the wading angler a 3 or 4 weight would be fine on smaller water but on large main stem areas where 60+ foot cases may be handy. Then a 5 weight would be a better tool, especially if there is a stiff breeze. If find that I often need a longer cast on the some of our bigger rivers than on the salt.

When fishing from a boat I'll often take 2 rods (a 4 & 5) with a floater on the 4 and sinker on the 5. The larger rod is nice if one needs to wrestle a fish from the snags. I catch a surprising number of silvers while cutthroat fish as well as the ocassional steelhead and humpy and again the 5 is a better tool.

Tight lines
Smalma