I'm a big fan of X-Plane. The graphics are glitch free on my P600, and the geopmetry is spot on.
I've invested in a CH Yoke, the most expensive part of this, but worth every penny. The only down side is that it's not possible to configure the engines to go - L-throtle, R-mixture, but rumour has it this has been fixed in the later versions.
Also nice to have the plates in V & H to check how well (or not) you've done.
S