Argentina would need frigates and patrol ships as rebuilding blocks
The suggested starting point for rebuilding Argentina's aging fleet is a dependable frigate and patrol-vessel core rather than a single prestige purchase.
It needs capable frigates and patrol ships, then a gradual rebuild around those basic fleet functions.
Notes
Much of the existing force is old or broken down, leaving a problem close to rebuilding from scratch. A usable surface-fleet foundation could patrol, train, and grow before Argentina reaches for more specialized capabilities.