Setup sounds fine to me. That's just a little wider, but similar height to what I'm running with
255/45-18 Front
295/45-18 Rear
If you get a lot of rain, and plan on driving in it (or know you'll get caught in it a lot), I'd stay away from DR's on a daily driver. They are quite dangerous in the rain. If you DO get stuck in the rain, turn your traction control off. If you do hydroplane, traction control tries to modulate the throttle and the car doesn't react the way you think it would, so instead of being able to correct it, you end up going sideways.
If you will only be driving it in good weather, then go for it.