My brother has the Sport A/S Plus' on his '08 G35x. They're definitely very nice tires, but they're pricey and a bit louder than I would have imagined. His are down to about 3/32 and have worn very even since new.
I have DWS' on the E90 and would not recommend them given the quality control issues, etc. that I have gone through with them.
As mentioned though, the RE970AS would be a good bet if you want a "sportier" all season tire. I'd also look at the Kumho Ecsta 4X given it's price and glowing reviews.