I was supposed to inherit my dad's old Model 12 until his nieces or their drug addict husbands stole it and a few other guns from his house while he was in the hospital before he died. Haunts me to this day because I know that gun ended up in some pawn shop for pennies on the dollar. Even had the slug barrel assembly and those are impossible to find anymore. Wouldn't have taken a million dollars for that gun if I had it today. Please take care of yours and don't let it get gone!
I couldn't narrow it down to just 3 because I have too many of my grandpas guns, 2 that belonged to my dad (model 94 30-30 and a 512 Remington) and the first two guns my grandparents ever gave me. Out of the guns I bought with my money I'd pick my Colt 1911 70 series, 870 12 ga, Winchester model 70 30-06.