Backstory: Right now I've got two desktop PCs running in my office. One is my daily use/gaming PC running Windows 10 and has an ECS H61 motherboard and a Pentium G620 CPU, HD7750 GPU, ~240GB SSD, and 8GB DDR3. The second is my media server and is running Windows 7 (for MCE) and has an ECS H67 motherboard, i5-2500K CPU, ~240GB SSD, and 4GB DDR3 along with a couple of 1TB storage drives. Both have 450W Corsair Bronze PSUs.
I've got it in my mind that neither PC is really fully utilized, and I may as well upgrade and combine forces at the same time, but to hopefully do so in stages and in a cost effective manner. I'd like to come in under or around $300 for this stage of the project if possible.
At this point, I'm looking to purchase a motherboard and CPU combination, and (preferably) keep my existing RAM, GPU, SSD, and PSU for the time being, then upgrade those later as time and budget permits.
Also, since the OTA TV tuner I'm using is an HDHomeRun networked tuner and I have found a way to configure it to directly connect to the PC serving the video, ideally I'd like to find a motherboard with 2 NICs in order to take the TV-stream-to-server network traffic load off my router, since my network traffic has been getting pretty cluttered lately.
First, sanity check: am I crazy for trying to combine the media server function into my daily use PC (full disclosure: I pretty much only game on it once a week and the rest of the time it's just doing spreadsheets and web browsing).
Second, if I'm not crazy, what should I be looking for in a motherboard and CPU at this time?