What's your feeling? If you're content with the headphones, why not consider some revisions to the components? If you went for the RS-1, would you mod them? Or, would you leave them stock? Lower level Grados that have had a bit of surgery done to them can come awfully close to a high-end sound. Now, the question is, is it worth spending $500 - $600 more on the RS-1 headphones for a 10% gain in sound improvement? It would be ideal if you could demo a pair of RS-1 headphones for a few days to see what you really think of them before taking the plunge. However, that is virtually a limited idea because unless you have a good friend with a pair, stores don't usually lend out headphones for a few days. It's actually too bad that they don't. I'd love to have that option.
I don't know, I've heard many different things about the gap between sr60i modded and rs1i, some claim it's a lot some claim you can get 80-90% of the way there. There is a dxcstore by me I suppose I could check in sometime and see if they have a demo pair.