Path to upgrade from 1Gbps infraestructure

Good day everyone,

We are planning to upgrade our current small shop that has 2 stacked switches N2024 and 3 Poweredge R710 with 4 network adapter each one, all is at 1Gbps.

We are considering to buy at least new 2 core switches and at least to new poweredge servers, thinking move up from 1Gbps which one would you consider the next tier 10 or 25 Gbe that could make sense from functionality and financials (budget friendly).