Focusrite Scarlett 18i8
Our mixer & interface is one of the most important components in our setup. All of our audio runs through this thing at some point and if it doesn't sound great there's no fixing it in post. It's the component that takes the audio from everything and runs it into the computer for capture.
After we had a couple Behringer mixers die on us, we decided to spend a bit more money and upgrade to a higher-end interface. What we lost in features (inputs / outputs, compression, etc.) we gained in pristine audio quality. Compared to this thing, the Behringer was a noisy piece of crap. After swapping it out, I no longer had to run any noise reduction or other cleanup effects on the final tracks, which saved me time and effort. Of course, we did lose our hardware compression for live shows but that was a minor, and easily fixable, problem.
Now that I've used it for a few months, I don't know that I'd recommend the Scarlett 18i8 for all uses. If you want to run your sources out of the 18i8 and back in, it's not easy. There are plenty of inputs but no real source ouputs other than L/R Monitors. So it's not great for live audio where you need EQ / compression but that's not really what it's intended for. For our recording purposes, it's a great unit.