I just faced the same decision
I've had a 3HP cabinet saw for 22 years. First a Unisaw, and then a PM66 for 15 years. The only time I needed more HP was when I used the table saw to cut full blade depth bevels on red oak for raised panels. The saw could only take the wood so fast, and at the speed the wood burned. If I pushed faster, the saw would stall, ( hard to push this hard). So, I just bought a SawStop and I ordered the 5HP. I also assume this is my last saw, and I didn't want to be lacking the HP in the future. But, now I have to rewire my panel in the garage to handle the 5HP, and from what I read, you really shouldn't use plugs on cords that handle a 5HP saw...joe