Project Cars should be coming next month:

Probably the best car simulation, what do you think?

I think I'd need a new super expensive graphics card to render that game with any decent frame rate ...

The minimum specs are not that high. I've bought a new PC about a year ago for X-Plane and FSX, hence no problem for my hardware. I will get the steamos version and connect

to my 4K, 3D TV. Any hints on that? Simply use some hdmi cables, that I've laying around for years? I probably also get a steering wheel, that I could use also for flight sims, if I find alike.

PS:

and with the upcoming:
http://www.oculus.com/
it should get fantastic...