Don't know much about brands but definitly would go with the type you insert in the end of the barrel and has a piece that sticks up even with your scope. Those lasers are crap my cousin had to move a .450 marlin 74 clicks to the left and 52 clicks up just to sight the rifle in after having it laser boer-sighted.
The magnetic boresighter by Leupold is suppose to be excellent. I have never used a boresighter of any type because I have all bolt actions and can look through the bore with the bolt out and get my gun on paper that way. I then shoot at 50 yds to get close before moving to 100 and beyond. This will get you real close quickly if you are using a bolt action.
Everyone has different ideas about trophy pictures. Looks around and you will see "long armers," "set behinders," "big cheesers," and "blood covered brutes." I have a few tips to keep your trophy pictures from being laughers or worse yet just plain gross.
#1 Clean it up. Try to avoid bullet holes, gut pile, mass amounts of blood, and the tongue sticking out. You don't want your big buck to look like a angry 1st grader with his tongue out or a MMA fighter during the 3 round.
#2 Long arming...