Do you need/want the full licensed season? If so, Codemasters is probably your best bet atm. If you just want some well done F1 cars, Assetto Corsa is really good, the recent Ferrari pack has the F2004 and there's other mods including for example the 1999 McLaren and many more. Project Cars 2 also has open wheel racing, Formula Renault, Formula A (read F1), Indy Cars, and some others. You won't have licensed seasons with rules, liveries etc.I'm intrigued, I love F1 but haven't really been too fond of the Codemasters recent F1 games. Is this abit more "definitive" and has decent mod support?
rFactor 2 also has a few decent Formula mods, then there's iRacing, with Indy Car. I've probably missed a few out.