I have almost identical stats to yours and am also planning to go the academia route. From what my own advisor has told me, the reputation of your advisor you work under/the types of journals you will publish in during grad is way more important than the name and prestige of the school itself. There are some spectacular and well-established organic faculty at schools that are not considered prestigious but are worthy of winning Nobel prizes (I'm assuming you're organic from your user). If Mass has these type of faculty then Mass being "low-ranked" is irrelevant. Your success during your graduate studies will determine whether you are qualified to go into academia or not, so I wouldn't stress the name of the school as much.