I'm not sure that Sage makes a rod these days with a comparible action to the DS2. That's a bit of a shame.
If you like the DS2, you might consider a used one. There are a million of them out there. After 'The Movie' that was the recommended first rod for a whole generation of would-be fly fishers. I bet more than half of them got used 3 times then put in a closet. I see them on Ebay and Craigslist all the time.
Rio Trout taper will be just fine. The DS2 is a nice easy casting all around rod. It is not terribly particular about lines so whatever line you usually like will work well on the DS.
I recently bought Rio's most recent iteration of the Trout Taper. The Trout Taper II. Its a really nice line. I am using a WT forward on post WWII South Bend. It is a slow but powerful rod and the Trout II is a good fit.
The Wt forward has the built in loop at the lines end. The DT does not, as many people cut back the end of a DT for improved turnover with heavy or wind resistant flies and their associated stiffer leaders.
I suspect the Trout taper might be a tad heavy but I have not weighed it. A 5wt feels more like a 5.5wt.