I've run the stock Mopar with chrome box, an MSD 6al, MSD Digital 6, and Jacobs Ultra. I've got to say, the feel, power, e.t. and mph numbers weren't all that different between them all. The 6al is nice because of the rev limit feature, but I never came up against it so it was kind of useless to me. The Digital 6 is nice because ofhte start retarnd, rpm retard, rev limiter, adn ability to hook it to other systems like nitrous controls or trans brakes, otherwise, it is no better or worse than the others.
What do you want to do with your car? Unless you have future plans that require any of the special features of the MSD systems, you can keep it simple with a chrome box and oem distributor.