FS9/FSX. Virtualcol may not be the best aircraft maker for FS but they do indeed make very good aircraft. I personally own their Cessna T303 Crusader and I am very happy with it despite lacking some features. This one i'll be adding to my purchase list.
Now they have released their Jetstream Super 31 and it looks very good. Now perhaps I can retire the freeware version I've been using for years. All I need is the Eastern Airways UK repaint!