My PT175 has a 40hp. With two trolling motor batteries, the starter battery, and a 55 pound thrust Minnkota kicker troller on the back, it sits pretty heavy in the rear. I guess I could balance it out by relocating the batteries in the forward compartment, but that would take some doing and I don't always have the extra trolling battery and kicker motor on. So from a weight perspective, a 75hp would be pretty hefty in the back.
From a power perspective, I wish I had gone up to the 75hp. The only thing that keeps me regretting that too much is $3.00/gallon gas! Yesterday afternoon, I got up to 28mph on the Potomac River with the 40hp with just me, fishing gear and a little under half a tank of gas. On the way back up river, I hit 26mph going against wind and current.
JC