Do you mean DD-WRT is not stable/reliable? Or the Linksys EA2700?
For sure DD-WRT & OpenWRT will be both stable and reliable and also routers from other vendors
would be matching also fine! Buffalo, Netgear, TP-Link and some of them came with pre installed
DD-WRT or OpenWRT firmware so you must not flash it alone.
is still a home setup.
There are also switches out there that can be done all things for less money, but but routing
must be done then at the pfSense it selfs.
Netgear GS105Ev2
Netgear GS108Ev2
Netgear GS108Tv3
TP-Link TL-SG105E
Buy two of them and then replace the both you own, the TP-Link ones are able to get for cheap
as ~25 € each and are capable of VLANs.
Replacing my switched for managed switches will cost around 200 euro at least?
One Cisco SG300-10 for ~180 € and one TP-Link TL-SG105E on top for ~25 € will do the job and
routes the entire LAN by it selfs!
I'm planning on buying a new wifi router/ap as well…
Get a cheap used one with GB LAN Ports and if ac is not really urgent
for you it will do the job also fine.