I use a modded Watchguard Firebox X550e with pfSense. I've installed more RAM, upgraded the processor, and installed a PicoPSU so it can run on a DC power supply with battery backup. All told it cost me about $80.
Just wanted to update you guys on this for reasons. Went ahead and bought the following. Knowing after that realtek chips apparently arent that great at this kind of thing. /shrug.
I totally forgot an AP though (DAMNIT) but ill get one next week or so.
I had a bit of an issue setting up. forgot to release the IP provided by my ONT which kept my router from gaining a WAN IP but I got it figured out. The thermal probs, smart data, and graphs work fine with this setup. im loving the options and granularity so far. Happy to have gotten off of consumer routers. Loving the experience so far!