Depends on the resolution level of the iTunes music. If the files are typical iTunes compressed, it would be a waste of money. Believe it or not, low resolution recordings usually sound better on low resolution playback systems. That's what they were designed for.

If you are ripping CDs in ALAC or FLAC and simply using iTunes as your library the system will sound good. Files optimized for iTunes will also be good. Lossy normal files from iTunes won’t sound better and to catch22s point may sound worse than on a lower res system.

The Roksan is a nice amp. Lots of power and very Musical from what I remember. It has been a few years since I have heard one.