My brother bought that 1 3/4 HP unit from Cabela's (a #42 neck size). That thing is a beast. We did six deer (one was a 278 pound sika) last weekend and that thing wasn't even warmed up yet. 80 pounds to fight with. Way more than needed for a normal hunter.
But he does about 20 deer a year for himself and customers.
That's what we have as well. It works great. It may be more than needed but we bought once and cried once and it should work fine for the rest of my life and my kids can use it too.