What's up with Rota SDR rims? They look just like the Prodrive GC-07's to me...are they cast instead of forged (like the Prodrives)? And then SSR makes a rim that looks just like them too... I think it's called the GT-7...and they say they're "semi-solid forged" or something like that. What's the deal with the strengths and weights of these three wheels? And why do Prodrives and SSRs cost so much more than the Rotas? One more question...do 18's look whack on a WRX without lowering it at all, or is that a must.