Well, is it important to you? I don't believe that the title of magna cum laude is going to make a bit of difference in getting into medical school (doesn't matter in your case). But if it's something that you want on your diploma, something that you want to follow your name/undergraduate institution into your career, then go for it. Attaining summa cum laude from my undergraduate school was important to me for prestige purposes and to make my parents proud, but I knew plenty of people who didn't care which, if any, honorary title went along with their GPA. It's a personal decision and I don't think anybody on SDN can tell you if you should/should not strive for it.