There is no doubt that the Russians make some fine aircraft . Some freeware models of the above are available . There is a tendency among some nameless people to belittle the accomplishments of Russian engineers, but they have shown innovation in a lot of their designs. I'm not great at flying helicopters but I agree the DCS black shark is probably the best helicopter simulation I've seen.
What to make next !??, possibly , a 747-100 and 200 with working INS.
I actually worked on those simulators back in the early 70's.
Just my 2 cents.  :) :) :)
Ron