Anything by Fanatec, but prepare to pay a premium. Thrustmaster do a couple decent ones also. Have a look at these - Clubsport, CSL, T300/T500, OSW some of the better ones.
I've been using the G29 for over a year, whilst it's not in the same league as the higher end models, it still does a good enough job for me.
And I really wouldn't consider a wheel for Forza 7, it's much better with a controller. ?The game is far to arcade like for a wheel, you'll put yourself at a disadvantage and not enjoy the horrendous FFB and feel with it. Keep that wheel for the known sims.