Playseat has been around in the iRacing Cockpit game for a number of years now and are very popular amongst many PC racing simulation enthusiasts and console racers alike. Their race car cockpits come in various shapes, sizes and configurations and support all major brands of sim racing components. Playseat have many endorsements from the Formula E, Project Cars, Playstation and various Formula One Teams. This can add to the cost of the particular race car cockpit that you are after. One of the major issues that some people on the internet forums have brought to attention is the centre post design of their wheel deck which for some people can get in the way of drivers legs when trying to use 3 pedal systems.
Playseat have iRacing Cockpits and standard Race Car Cockpits that are suited for PC, Consoles and support major sim component systems and come in GT Cockpit and Cockpit F1 Designs. The cost for a Playseat is around $600 or you can get complete systems. You can check them out here
Obutto is another race car cockpit designer that is very popular amongst the race sim community especially with their top of the line R3volution which is more of ergonomic workstation than the typical race car cockpits and iRacing Cockpits that you see around on the internet. Everything on the Obutto is adjustable to fit that largest and smallest sim racers, due to the dimensions of the Obutto when installed it is probably more practical to use it primarily for PC sim racers as opposed to the console community.
Obutto race sim cockpits come in two flavors the smaller Obutto Ozone and the much bigger Obutto R3volution. Both units support all major designs of racing sim components. The smaller Ozone costs around $400 and the larger R3volution comes in at $800. You can check them out here
Rseat is another makers of excellent iRacing Cockpits in a number of designs from GT style cockpits with motion ability and they have a well designed cockpit f1 which gives the formula one sim racer the ideal seating and viewing position for formula one titles. The various Rseat designs suit the major sim racing components and have various accessories to mount keyboards and other various equipment.
The Rseat has endorsements by Assetto Corsa and come in various color combinations. The base level Rseat costs around $1250 ranges all the way through to $1650 you can check out the RSeat products here
There are many more iRacing Cockpit designs and designers out there that create products similar to those above that do race car cockpits and cockpit F1. Please feel free to add any other designers in the comments section.