the pure audio you refer to will the untrained ear be able to hear the difference?
I think the answer to that is subjective and I won't purport to know what everyone else is capable of hearing. I always choose gold connectors, if given the choice, just because I've been lead to believe that they're more durable and are typically tied to higher-quality products. I doubt its going to be a difference you can hear in a day 1 comparison, but maybe on day 800+ it may make a difference.
I like gold connectors, something about higher conductivity....
Separate Note: If my memory serves me correctly, the Xtreme Audio only has one mode (Entertainment) whereas the Xtreme Music and higher have the 3 modes (Entertainment, Audio Creation, and Gaming).
If he's looking for the most economical solution go with the Xtreme Audio if he wants the flexibility, I'd recommend the Xtreme Music or higher...but not with X-RAM as a consideration.