Nikon's MONARCH 3 has the better glass over Nikon's PROSTAFF 5-7 Series of scopes. As for flare looking into a setting sun I think almost any scope will give you that. I have used a sunshade when hunting KS and looking West during the sun set with no problems. In case you did not know, Nikon currently has a big PROMO going on right now for their longrange scope's, some of the best deals of the year can be had at all levels. If you do decide to choose a BDC reticle and need help, drop me a note. Make sure you check out THF Sponsor's before buying your scope to see if they can help you out.
Here's a pic of a MONARCH 3 4-16x4 BDC I was using for a Nikon shooting event.