You'll probably never get another cat that's just like Max, true. But the next cat you get, you'll love just as much for his or her own idiosyncracies, cuteness, silly habits, the fact that she follows you around the house, etc.
When I had my precious Rookie PTS in 2008 due to epilepsy, I was absolutely devastated and honestly, looking back, it was traumatic. The house seemed so empty without her. It was only 4 days later when I started looking at the SPCA listings again, and it was 3 weeks later when we brought home the silly, fun, crazy little Murphy, an affectionate orange boy who was thrilled to be out of that cage and made our house his personal jungle gym. They're completely different, those two, but you love and appreciate both of them for who they are.
I'm so sorry for your loss. Everyone here knows how devastating it is. Please believe me when I say that eventually, with time, you'll adjust to it. It's amazing that we humans put ourselves through this over and over, but what's the alternative -- leave another cute, affectionate orange boy in a cage???
Holly and Murphy