Need a good video card and a wheel or some type of a control.
Need Cable or dsl connection
I mainly run iRacing because you can racing just anything at any time. No dirt but still fun
rFactor is where all of the good dirt sims are you will need to buy it. Boz sprints and dirt factor are pretty and the SBS dirt mods are OK but I prefer the first 2.
rfactor will be the cheapest way to go because the mods are free iracing you pay for just about everything but everything works and you can always find a race.
Wheel best bag for the buck http://www.logitech.com/en-us/gaming/wh ... vices/5184