Well IMO there is no perfect router, and firmware combo.
Looks like you have a simple needs router. Basically non remote devices are hard wired.
Wireless printers don't require a router, if using authentication to connect, unless you cloud print. My printers don't connect to the Internet, so i do manual updates if needed.
Looks like you are not even using G, or can setup with an N connection. So it looks like ASUS us the way to go, especially if you are already familiar. As ASUS has some strong N and AC routers. I chose the linksys for G in multi story house. Which few routers are better at with G.
Luckily there is one ASUS router that is one of two routers that can run Untangled, if you find OpenWrt not to your needs. I forget the model but, you may look it up on the Untangled wiki. The linksys wrt1900acs is the only other router, which I have and will try OpenWrt first before moving on to Untangled, if i find a need to.
So i would look at a router that has the greatest support offerings, and abilities. So far I only see a few wrt offerings that are worth trying, as they are more active than the manufacturer that supports the product.