I would strongly advise against SOMA's policy (and last I checked, AMSA used the same company, so same with theirs). MEGA Health and Life is an awful company. They denied virtually every claim my family submitted, even though they were covered by the policy. We wasted a ton of time fighting with them to get them to pay & then they'd pay at a discounted rate (based on what they felt the Dr should have charged).
That all said, it is a group policy and if you are already on a group policy and you (or your family) have any kind of preexisting medical condition you probably want to stay with a group policy to maintain current and future coverage for that condition. If you do need to go with anything through MEGA, I recommend their most basic policy. They first offered that my last year of school & it saved my family a ton on premiums and got us nearly the same coverage as the next step up.
If you're young & healthy or you're not already on a group policy, check out other individual policies from Blue Cross, etc.