Don't mind me, just comparing prices.
640kb/s Download and 128kb/s Upload = $300Ars = $20USD monthly.
3mb/s Download and 512kb/s upload = $240Ars = $16USD monthly
6mb/s Download and 768kb/s upload = $273Ars = $18.2USD monthly
12mb/s Download and 1.5mb/s Upload = $303Ars = $20.2USD monthly
30mb/s Download and 3mb/s Upload = $630Ars = $42USD monthly.
...
This doesn't make any sense at all. 640kbps is actually more expensive than 6mb/s