[NANOG]Hardware for MPLS/SR network

Hi! I’m looking for equipment to build a 100G MPLS/SR network. This won’t be a large setup—likely around six PE routers connected in a 100G ring, with distances ranging from 100 km to 400 km. These routers will also need to aggregate local links from 10G up to 100G. They don't need to carry a full table. Given that I’m aiming to keep costs down (an impossible equation? 😊), what manufacturers would be worth considering today? Is refurbished hardware still a viable option, considering licensing and other factors? Mikrotik’s CCR line is quite affordable, but would it be capable of handling a PE role while aggregating multiple link speeds? Buffering? Other options? Br Johan