Will you mic the amp routinely for stage and house volume? If so, a 5F2A may work with a five piece band and careful attention to the PA. If you don't plan to mic, you need a pretty loud amp- 5E7 Bandmaster size as a minimum, best would be a 5F6A Bassman style amp.
If you're not too devoted to tweed covering and vintage vibe of the 5F6A, &c ...