I am peaking in now and again.
As in the other thread...if you expect max performance, you will want to go with an appropriate tire. Going less expensive may save some monies, but may be a waste when they dont live up to your lofty expectations. Tires to consider that may not be quite as expensive are: BFG KDW (great reviews), Kumho Ecsta MX and Toyo T1-R. Of the three the KDW offes the stiffest sidewall and would be more comparable to the S03 in this department. T1-R will offer the best wet performance with dry. The Kumho MX has been a popular autocross/street tire. The new PS2 is a nice improvement in the Pilot Sport. Michelin has gone with the assymmetric tread design and I love this idea. Optimized tread pattern more solid on the outside for lateral and high-speed stability more void on the inside for water evacuation. Good reviews and I dont think you would be dissappointed when comparing to the PS. Price...that is another issue. S03 is awesome and stiff. If you like bone jarring ride and instant turn in then this is your tire. As for a replacement...it must be coming, but I havent heard anything yet. I would not classify the ES100 and Fuzion in the same as the others. Cheaper, but not the same.
You could go with the same size all around, but why ruin that beautiful staggered stance. Love the lip in the back. Some people would kill for that....