copied out from a.net, you could also check wikipedia for the engine options.
777-200-------------------------------------------------------------------
GE90-77B: 77,000 BET
RR Trent 875: 73,400 BET
RR Trent 877: 76,000 BET
PW4074: 74,400 BET
PW4077: 77,000 BET
777-200ER-----------------------------------------------------------------
GE90-85B: 84,700 BET
GE90-90B: 90,000 BET
GE90-94B: 93,700 BET
RR Trent 884: 83,600 BET
RR Trent 892: 90,000 BET
RR Trent 895: 93,400 BET
PW4084: 84,400 BET
PW4090: 90,000 BET
777-200LR-----------------------------------------------------------------
GE90-110B1: 110,100 BET
777-300-------------------------------------------------------------------
GE90-94B: 93,700 BET
RR Trent 884: 83,600 BET
RR Trent 892: 90,000 BET
RR Trent 895: 93,400 BET
PW4090: 90,000 BET
PW4098: 97,900 BET
777-300ER-----------------------------------------------------------------
GE90-115B: 115,300 BET