It is really nice to see the quick responses to the OPs request. This type of response represents the best of Head Fi as far as I am concerned. This is what keeps me coming back to Head Fi as well as posts such as Davids which are a truly amazing gift to this wonderful hobby. Many thanks David for your marvelous contribution. I read the entire post when you first contributed it and continue to monitor on a daily basis.
Thanks for the great advice, looks like I will pursue the Sennheisers. I'm going to visit a store that sells them. I went to a shop today and was really surprised by the Grado PS500, btw. I tried a number of headphones including an HD598 and HE400 but the Grados really stood out --I like the sound they make. They sounded great to me, however the treble was so powerful that it was almost silly and too distracting to listen to music. Anything else you would suggest based on my discovery?
the HE400 is closer sonically to the the PS1000 than the HD600, so you may prefer them:)