You may want to wait for the 10x5, which should be coming out shortly. I did not have the Platinum, but had the Sonata and two Dynavectors 10x4II and 20x. The Dynas sound more lively and exciting while the Grado is more laid back with a lush sounding midrange. If you listen to a lot of vocals the Grado would be better, for everything else go for the Dynas.
