Depends on the use. If you go with 315's they will all be DR's or REALLY expensive street tires. OR, get 285/40/17's. There are some nice options out there in that size. It's what I use.
Crap, I forgot about that tire. That's a good option. The tread pattern on those are really wild and on such a wide tire you will really see it. That may be good or bad. I have the Ecsta 712's and have had the sumi's in the past. Not sure what i will do when it is time to get new ones again.