I've mainly been playing small downloadable games on PC for the last decade. Been thinking of picking up PC strategy again, not sure if I missed any strategy gems since then, but I enjoy good RTS and city builders (not much the RPGish ones). Things like DOTC, C&C series, WarcraftI/II, AOE1/2, Starcraft, Commandos series, Theme Park/World, Theme Hospital, SIM series (Tower, City, etc), CivII, B&W1/2, Constructor, Pharaoh, Oasis, Dicewars, Lux DLX, WarLight, etc...
Recently bought Company of Heroes 1 as discussed here, and the current humble bundle has Ultimate General: Gettysburg which looks interesting (need to research it further).
Saw few months back some nice developments on PC with Cities: Skylines and Stardew Valley.