Running of a raspberry or a simple arm router is a pain for snort and pfsense is a no go. Throughput with a usb nic is roughly 150MBit, in on one interface an out on the other, however there is to ...

That's the main thing for both router performance and media playback (unless you get a standalone video card). The celeron is probably fine for the basics but if you want to do a lot of VPN traffic or ...