help with flight sim picks

Want some good flight sims. I'm looking for ww1, ww2, and modern flight sims. I would like some suggestions. Your help would be appreciated.Must be for pc only.

Thanks, Fustar

ww2: il-2 sturmovic and all its expansion packs (really the best!)

modern: lock on (although very deamnding on hardware and a little buggy)

ww1: I havent seen one in ages!