I can help with B747-400:
(All approximate for mid weights)
V1 - 118 upwards
VR - 120s
V2 - 140s
Stall speeds vary from 190 clean to 110 or so in landing configuration.
Obviously the speeds vary for runway and conditions, I hope these help.
I'm sort of surprised that these vary so much from those in MS FS 2000 Pro! 777-300 there: V1 - 141 KIAS, Vr - 153 KIAS, V2 - 160 KIAS. Or is the B744 just so different from the B773? Might the greater gross weight be the reason?
Is the Final Approach Speed for the B744 about 140 KIAS?