Of those the Leupold might be the pick if they are up to $300.Since this is for co-workers asking the question at this time, I would say they are not very serious hunters and probably won't go out more than a couple of times a year so recommending anything over $300 is probably pointless. You want them to set it and forget it because they probably won't spend the time to learn how to use the scope properly nor will they get allot of trigger time in. I would not recommend target turrets or any other tacticool feature. I would not recommend fixed power or a 30mm tube. For a relative novice, I would recommend a 3-9x40 with a simple plex reticle of some kind. The cheapest I would consider is the Bushnell Trophy HD for $150 or less. They are really good scopes for the money and for their purposes probably the best choice. On the high side, the leupold vx freedom 3-9x40 is a good choice for just under $300, The Nikon Prostaff is a good scope for the price. You can find them on ebay for under $150.