Step up from the DFGT is the G27, with a H pattern shifter and clutch. Many people swear by this wheel, I have one myself and can't complain. Up from that is the T500rs, double the price of the G27 but is apparently a lot better.
There are also Fanatec wheels, but I don't really know to much about them. Someone will chime in to let you know about them I'm sure 👍