@Racin510s I recognize your screen name from the GT6 Seasonal Event threads. I think you'll be VERY happy with Assetto Corsa. Unlike GT6, you're not worried about collecting credits to buy cars. You already "own" every car. And while some people put down Assetto Corsa for their relatively small car list, having Assetto Corsa on PC means you can install a TON of user created modded cars. Now, many of those cars kind of stink, in my opinion, but everybody has different opinions and there are several hundred cars available to download for free and try. The same applies for the tracks. Most user created tracks aren't as good as the official Assetto Corsa tracks, but many are outstanding and many are certainly acceptable. There are plenty of tracks to keep a person from ever getting bored.
The first thing you're going to notice about Assetto Corsa, compared to Gran Turismo 6, is how each car really does feel different from each other. With GT6, I often felt that you could take 10 street cars and the only thing that felt different between the 10 cars was the amount of power/torque each car had. In AC you really get a unique driving experience with every single car.
Many street cars have very few things that you have to worry about "tuning". So, if you're not the greatest car tuner, like me, you don't have to worry about adjusting things like LSD, spring rates, gear ratios, etc... Race cars are a different story, of course. Some race cars have so many adjustable settings, my head spins! LOL!
Finally, I recommend checking out this thread:
http://www.racedepartment.com/threads/assetto-corsa-logitech-dfgt-settings.77586/ for advice on setting up your DFGT with Assetto Corsa. Have fun with your new game. Welcome to the club!