Thanks PGMusic for sending me the 2011.5 audiophile (wav) version for my new windows 7 64bit computer. The comparison between my existing non-audiophile (wma) 2011 version on my old 64bit comp played back through the same Hi-Fi sound system:
increased clarity and crispness for all instruments (Brent's guitar sounds even better). In summary: much more presence

And it runs just as fast on loading from the existing supplied external drive as it did on the internal drive of the slightly older Vista comp. I was doubtful but now vote it well worth the extra dollars.

Cheers

PS: its been mentioned before but if you transfer an existing file from the old system don’t forget, like I did to un-freeze, any frozen tracks otherwise they wont play.