At the moment i got a router-modem-combination from my ip and i want to be more independent.
Therefore i want to use the provided hardware as bridge and buy my own router to manage my network.
In my home network i got
2 Desktop PCs (cable)
1 Switch (cable)
Several WiFi devices including smart home devices
Pi-Hole
Mac Mini as a linux Server (cable)
Synology NAS (cable)
AVM repeater
Before i start my own extensive research, may you recommend me a Router for my setup?
Get a somewhat recent Fritzbox and connect all your hardware to this device and then configure it to use your ISP-provided as uplink in the Fritzbox configuration. Since you already use an AVM repeater it should work well together with a Fritzbox.
Yep, it's the easiest solution. You could also check if the provided hardware is necessary or if your ISP allows other devices to be connected. Then you could use the Fritzbox directly.