I purchased a Shuttle DS68U with a 3855U a year or so ago as a discontinued closeout for $168. I added some spare ram and a ssd. It works great for my needs.
Just for fun, I'm thinking about building a router on a stick, but only because I have the spare parts around the house. It's older stuff but still useful and has lowish power consumption. This one is a Dell 3020M with an I5-4590T. Overpowered for use as a home router, but just sitting in the closet. The electricity will add about 50 cents to $1 or so a month.
I'm also considering re purposing an old laptop pc when I replace it in a few months, also just for fun. It's a dell e7240 I bought used for $150 a while ago. It has an i5 low electrical draw cpu, about the same power consumption as the Shuttle DS68U, but 2x as powerful according to the Passmark. It would also be a router on a stick. I'm curious to see if I can turn a random scrap laptop PC into a reliable high powered firewall.
The point: Shuttle is A-OK in my book. On the other hand, if you're only buying for home use, then the newest and best is not necessarily needed. The router doesn't care. The total cost outflow is important, too.