The 757's have ife on the long-haul segments. The F100's are fun and like to bump around in the sky and the 319's are fresh and nice but too 'corporate-like' inside. All that grey and new seats make it look weird.
The F-100 is one of my favorite planes. VERY quiet. As for service, in coach you mainly get drinks and USAirways snack mix.....a fine combination of ranch bagel chips, pretzles, and cheese crunches. I have been on most of USAirways' F-100's.
The best thing about the US 757 configuration is that the coach cabin is split into two sections. No endless tube syndrome like on other airlines. The lavs are in the middle of the plane just before the 3rd door.
And they do have IFE. There are television screens every so many rows. Unfortunately, no seat back video.