Are you talking about the Dunlop Star Specs? Those and the S.Drives are 2 very different tires. The Dunlops are a very good tire for regular, competitive autox use. Whereas the S.Drives are more of a true street tire and cannot compete with the Star Specs as far as overall grip does. Out of those 2, the Star Specs take the cake.
If you're only using these for warmer weather and won't be ranking up a bunch of miles on them, you could probably get away with a couple years using the better autox street tires. Such as Dunlop Star Specs, Bridgestone RE-11's, Toyo R1R's, and Hankook RS3's. For those, I'd say your biggest determining factor would be price if you're not a serious competitor. All of those are very good tires.
The best all around tire for dry and wet grip would be the 195/50R15 Toyo R1R's for our cars. They do make a 205, but the 195's are single compound and are more consistent with grip and are better than the 205's.
If you want something a little cheaper, that'll last longer and more appropriate for regular street use, then those I listed probably aren't what you want. The Yokohama S.Drives are nice, I have them currently as street wheels for my black race car. I found my last set of street tires for that car, Kumho SPT's, to be a tiny bit better than the S.Drives, but close. Other than those 2, I wouldn't really go with anything else for a decent mix of regular street use and autox fun.