[jan-jaap]

Cisco 3845 or 3945 ought to keep you occupied for a while

Plus you can stick an NM16ES switch module in it and kill two birds with one stone.  And a caching proxy in another slot and a VPN and a telephone system in another slot and all kinds of other interfaces. All kinds of good stuff you can do with those things ... much more fun than a dumb soho home device.

Looks like that think is bigger, makes more noise and uses more electricity than my file server. Meh.

And they've been unsupported for > 3 years. There have been > 100 CVE's in Cisco IOS since. Cisco won't tell me which CVE's apply to these -- it's unsupported after all. :-/

Personally I use a small PCengines APU running pfSense as my router. I think it uses less than 5W and can keep up with my FTTH internet (750Mb/s up/down). If I wanted more power and more application services, I'd probably replace it with a NUC with ESXi and put everything in dedicated VMs.