Congratulation's!!! That is a great rig!!!
I would recommend the hydraulic steering. I have it on my Ranger and I think it is great. I didn't have it on my Princecraft with a 150 and wish I did many times. When you have paid that much for a loaded rig why wouldn't you get it now rather than wishing you had of put it on later.
Honda's are big heavy motor's, stick a kicker on the transom and it is going to be a dog out of the hole. If you had of went with a 175 2 stroke you would have less weight and a better hole shot with a higher top end. Just curious why you decided on the Honda 150 4 stroke? I've never really looked at the price of the Honda's, but they would have to be more $$$ than a Mercury of the same H.P. for example. How long is their warranty?