I looked up diameter, weight and price for a few tires of the OEM size (245/40/18) at Tirerack. The Hankook Ventus V12 is not listed at Tirerack, but it's replacement the R-S3 is.
OEM ADVAN A13C 25.6" 26 lbs $330
Dunlop Star Spec 25.7" 27 lbs. $202
Kumho XS 25.7" 26 lbs. $164
Hankook Ventus R-S3 25.7" 26 lbs. $211
Michelin PS2 25.7" 24 lbs $278
The Kumho looks very good to me...
