I don't know how far along you are on your rifle but thought I should speak out AGAINST your scope of choice, the Vortex Viper PST
6x24x50 Illuminated FFP. I know a lot of people here like Vortex scopes & dollar-for-dollar they seem to be a good buy. My concern is going elk hunting with a minimum magnification of 6x. Although I have always gone elk hunting prepared for L-O-N-G shots, I've most often been presented with close shots, between 9 and 25 yards. Up close & personal a 6x scope takes too long to get on target so I recommend a minimum magnification of 4x OR LESS. I know a lot of elk hunters who hunt with 1.5-6x scopes for this very reason. (My next elk scope will be a Leupold 3-18x50 illuminated B&C.)
I wish you luck! You are 3-steps ahead of most since you are asking experienced people for advice. May the gods of elk hunting grant you success!