Im a rather carefull player, and probably build my empire alittle difrently then most... I usually play sweden
My focus be to unite the scandinavian provinces, Norway, splitting up denmark, taking gotland, skåne, halland and själland... id be sure to get the new islands off shetlands and faeroes and island...
Second face is to secure the easter borders, and that is to gain the kola, karelia, ingermanland and sweep up along the coast to secure the white sea, also further expansion along the frozen north...
Having this as a base allows me to colonize greenland and northern canada, or explore east as mentioned earlier...
I do this for several reasons, mostly is, that prolonged wars in the poor provinses of the artic, is something many avoids, defensive wars fought there and you can see their armies melt away... and the provinces might be poor as a base, but with production bonuses they become rather deasent... Its true that you ingringe upon russian sphere of interest, but there are plenty of richer spoils to the south off where im going, same goes for canada, and its far more possible that your getting it as most will go for the rich spoils, and when your established, no one really want to fight wars in the snow for whats bad provinces, unless of course your also focus production...
Thats alittle bit of my mind... of my Minor dominant major power Sweden