sorry man no clue.. RS wheel.. by end of next month.. you can wait that long.. but .. remeber RS is more of PC wheel then PS3, Fanatec did mention it works currently with some PS3 games and GT5P, But in the future it might not as more updates comes.. but who knows. I play Both PC and PS3, So I do not really care about it, as long GT5P and GT5 works. Besides seems RS wheel is way cheaper over TURBO S.
So if you are looking to buy PS3 wheel, email the Fanatec guy (he is in these forums) on which wheel to buy for best price specifically for PS3.
I don't know about buing G25, sure good wheel, but for me I never like idea to buy the same thing. My first wheel was DFP, GOD what an amazing wheel I thought, then G25, JESUS! even better, Now I can't wait for Fanatec, they offer more then half the features and NO dead zone over G25. So I am excited about it. (hmm 40 more days or so? )
So yeah, buy something new and fresh, save up. I don't know how to fix the centering problem. These days nothing lasts more then 2 years lol.