Just getting back from GolfTown and purchased my 915's....
915 D3 Driver with Aldila Rogue Silver 70 (95 MSI)
915F 3 Metal with Aldila Rogue Black 80 (110 MSI)
and three (3) Hybrids with Aldila Rogue Black 85H (95 MSI)
The only upgrade was the grips to Titleist Tour Velvet Chords and custom lengths. Prices are up substantially from the 913 line but I'm sure the other OEM's will follow Titleist's lead on this.