Best Transcoding Machine Specs...

I’e read all over the forums and on Reddit, and can’t find a simple and straightforward answer to this question:

What hardware should I be looking at to do hardware transcoding to h.264/265 quickly and efficiently?

I’ve read that certain GPU’s will handle the encoding part of a transcode (I already have the decode done in hardware) BUT many people say the qualityof GPU encoding sucks - is this still the case? Even with a high end GPU?

AND if the answer is get a high end CPU to handle transcodes, what one? I’ve got an older core i7(2600) now, and it seems to work pretty well but my server is becoming more and more popular with my family and I don’t want to run out of streaming ability.

Budget isn’t the main concern here, but I would like to get the best bang for my buck.

I’m using Plex to DVR shows, and real time transcoding to h.264 using the experimental plex option (woks perfect for me so far) as well as streaming a LARGE library of blu ray movies and tv shows.

Thanks in advance for your help.