I think the 384 option might be too little to go against the screamer's R399 uncapped all the time.
384:
Max over weekends: 8.9GB = 35GB @ R99
Comes to about R2.8 perGB for harcore downloaders.
I'd put that at about 11GB a month (using it when awake), or R9 per GB
512
3GB = R229. So 30GB @ R328
Comes to about R11 per GB
MAX:
47GB (3GB + 1GB +1 GB + R99) @ R416
Comes to about R8.8 per GB
4M
3GB = R259. So 30GB @ R358
Comes to about R12 per GB
MAX:
379GB (3GB * 12 + 1GB + 1GB + R99) @ R3405
Comes to about R8.9 per GB
Night rider is still the better option for budget conscience people.