Mozey,
Congratulations on your ram and the desire to hunt sheep again, whatever color they may be. Just having a sheep hunt under your belt or having one in your future changes who you are.
As for which species to pursue next that is a personal matter and advice from strangers is a bit like the old Ginger or Mary Anne discussion. But since you asked and I never tire of discussing sheep hunting I will offer up a few thoughts.
When talking about sheep hunts even within the same species there is just no way to compare apples to apples. Every hunt area, outfitter, animal, weather, year is different. With that in mind, in general I know of a higher percentage of stone sheep hunters that have returned to the lower forty-eight from Canada without a ram than can be said of dall hunters that tried their luck in Canada. So if we assume a worse case scenario, multiple hunts may be required to bring home a single stone sheep trophy. I suggest you take on the stone hunt first while you have more health and earning potential than you will in later years.
Then if the day should come when you still "need" a dall and the steel in your legs and your take home pay has decreased substantially at least you have saved the most accessible, affordable and accomplishable hunt for last. There are dall hunts (think helicopters in the NWT) that literally can be accomplished by hunters well past seventy years of age. Sure they cost more than some hunts in Alaska but the success rates are much higher and heck they still "only" cost about 60% of a comparable stone sheep hunt.
Complicating matters is the fact that BC recently banned grizzly bear hunting in the province. How do you think the outfitters are going to compensate for that lost source of revenue? My guess would be that the prices for their other species will rise to fill the void. BOOK SOON! Chance are you won't be able to reserve a stone sheep hunt for three to four years so that gives you time to save $$ and research that dall hunt you're going on someday.
Good Luck!!