The Grado amp is one of the most overpriced pieces of gear I've ever seen. Google an image of the RA1 with the top removed. I love Grado cans, but that amp
There are many less expensive products out there that will perform much better. Head over to head-fi.com for a lot of info.
That said, the Grados are very efficient and many not benefit much if at all from an amp.
How do you suggest i get the best sound form that PSX of mine to those headphones? Thanks for the advice thus far.