Check out Alcorn-McBride. Their players are used in many large theme parks and entertainment venues. They are rock-solid, reliable playback units. Some can be updated and controlled via a network connection.
http://www.alcorn.com John
Dual 2.5 G5 4 gigs RAM OS 10.4.8 QT7.1.3
Dual Cinema 23 Radeon 9800
FCP Studio 5 (FCP5.1.2, DVDSP4.1.1, Comp2.3, STP1.1, Motion 2.1.2)
Huge U-320R 1TB Raid 3 firmware ENG15.BIN
ATTO UL4D driver 3.50
AJA IO driver 2.1 firmware v23-28
Pro Tools HD, Yamaha DM1000, Genelec Monitors, ISDN