I like Real Flight G3.5 bought mine used from RCU and use it all the time to keep me sharp. Mine runs from a Dell XPS Gen 600 w/ 2G ram, G-Force 7800 GPU and X-Fi 3-D srround sound it runs very smooth. It's even more fun with three 19" flat panels from a Matrox unit. I can have multi views up and in dual player mode we each get a screen as well as half the center one.