What will your friend be using the rifle for? What kind of reticle is he wanting as well?
I've no experience with two of the scopes that you are checking out. I have four Leupold scopes and three are the VXIII line. I really do like the Leupolds and I think they are worth the money. I've been buying most of them for around the price of the Nikon Monarch maybe a few dollars more.
I really like the lower power end on my hunting scopes and objective bells no larger than 40mm. I have one VXIII in 1.75-6 and two in 2.5-8, most hunting situations don't call for any higher power. I haven't seen any Leupolds in 2.5-10 except the LPS which I think has been discontinued for the VX7 models. If you can find an LPS you will get it much cheaper than the VX7 which I think runs about $1800. If your friend wants the top end of the power he will have to start around 3.5 power in the VXIII Leupolds.
Before anyone thinks I'm a scope snob I do use other scopes such as Barska, BSA, Bushnell, Pentax, Tasco, and Simmons even had an NC Star once. I just bought a few rifles that I felt were deserving of better quality scopes. I've looked enough through Burris, Nikon, and Bushnell Elite rifle scopes to be very interested in them as well and wouldn't turn them down if the price was right.
I'm considering the Bushnell 4200 2.5-10 for my .25-06 that I'm having built. I plan to use this for a pronghorn and preadator rifle. Unless I can come up with a NIB or slightly used LPS, I just don't have the money for the VX7 after paying the gunsmithing bill for this rifle.
I don't like AO scopes on my hunting rifles but they are fine on my Varmint rigs. Unless I'm at the range I find I set the AO on 300 yards and leave it when I'm shooting varmints. On colony varmints and targets a 5-15 or higher power will serve your friend well except he will find the caliber will probably wear him down fast if that is what he is using it for.
Tell your friend if he is seriously considering the VXIII scopes to check out Zeiss Conquest and Nikon Monarch scopes as well. Check out this guy for a great deal on a VXIII scope, I picked up the 2.5-8 that I used on my black bear hunt for $370 NIB shipped to my door.
http://www.alaskaoptics.com/