TDU2 isn't out yet, so where else can you get your fix?
I would like to propose this title: 'MOTORM4X Extreme Offroading'
It has good graphics, good physics, good variety of races/challenges.
Uhh, what else? Front and rear dif-locks, 4WD/2WD modes, Hi/Lo Gear, Fuel/Petrol Stations, Supports the G25's H shifter (although no clutch input, you can pretend there is one though). 3 smallish maps (forest, snow, desert) of good quality and with a weather system (rain, lightning, thunder, fog, snow, etc). No day/night cycle. Performance upgrades (springs, tyres, etc, etc).
I bought the game from a shop for $20 to use it in an upcoming movie later for SpeedCarProductions. I had a quick stint again at 1080p and it looked very nice. No dasboard camera or TrackIR support unfortunately, but there are number of other views. Damage is also in game, which you need to pay for. Unfortunately I threw caution of the wind yesterday and drove flat out and managed to bankrupt myself, so I'll need to do a few races if I want to contine.
Here are a couple of the official videos:
Feel free to comment, ask questions, and recommend your own favourite offroading games.