SA-XR25 or SA-XR45 ?

The only diffs I can detect btw these models is:
DTS: 96/24 supported on XR45
"Multi-Source Re-Master Processing"
# of digital inputs (3 vs 4)
Remote control (custom vs universal)

Here are Panasonic's links to both:
http://catalog2.panasonic.com/webapp/wcs/stores/servlet/ModelDetail?displayTab=F&storeId=11251&catalogId=11005&itemId=63386&catGroupId=11135&modelNo=SA-XR25&surfModel=SA-XR25]XR25
http://catalog2.panasonic.com/webapp/wcs/stores/servlet/ModelDetail?displayTab=F&storeId=11251&catalogId=11005&itemId=63385&catGroupId=11135&modelNo=SA-XR45S&surfModel=SA-XR45S]XR45

I found the XR25 for around $220 (vs around $290 for the XR45).
My main interest is stereo MP3 playback (*not* movies or 5.1).
Why should I pay more for the XR45 ?
Will this "Multi-Source Re-Master Processing" feature make a significant diff for MP3s ?
Thanks !