Welllll... I'd choose Exeter! But I applied there and it's a lovely place, really friendly staff too. Why have you ruled it out, out of interest?
From the remaining three - Birmingham (ABB), UEA (BBB) or Sussex (AAB/A*BB)... Do you have a preference for the course? History and Philosophy sounds brilliant to me, but then you may have a different view. Have you visited them? Basically, initially ignore the grades and go for the location and course that appeals to you most. Then, factor in the grades to make a good decision based on firm and insurance choices.
Taking all five into account, I'd put Exeter as my firm and UEA as my insurance. Ruling out Manchester and Exeter, I'd put Birmingham as my firm and UEA as my insurance, as you're thinking of doing.