If you want a good sim for cheap or free try Grand Prix Legends and 1000s of addon tracks for it including oulton.
Its a very hard sim to drive but still one of the best around imo after it they made the Nascar sims then Iracing.
It's hard to get into on the original and alien setups. I tried an experiment once where I used settings closer to what the 60's cars would have done, raising the ride height to typical levels the cars actually used back then (4 inches rather than the minimum 2.5 inches) and soften the suspension accordingly and it's surprisingly easy to drive. You don't lose as much speed as you'd think either - perhaps a second around an average lap - though GPL is mostly about feeling comfortable and having confidence in the car, and doing this helps.
Then again, what attracted me to GPL was the challenge. It had a fearsome reputation in 2001 when I started, and while that can make it frustrating to lap, it can feel incredibly rewarding when it all comes together.
Of course, GPL looks ancient now, but it was released in 1998... and frankly if you're picking a racing sim based on graphics, you're approaching it horribly, horribly wrong.
A lap around the old, mad Watkins Glen road circuit (watch for the jumps!).
(No, the real cars wouldn't have done the big jump like that, but even with damage on, you could get away with doing this in league races).