Plenty of good advice. We've had a deluxe 4m searider for 20 years now - cracking boat and still gets used a lot. Just about to get it re-tubed and hopefully get another twenty years out of her! Originally we had a 40 hp two stroke yamaha on it, which was great, but when the time came for a new one we went for a honda 4 stroke.
It is a bit better on fuel, and quieter obviously and the added benefit of not having to add oil that often, but these are all minimal benefits. In my view a 40 is plenty powerful enough - one up and flat out you get a fair bit of chine wobble, and the only time i have ever really felt a bit more power would be good is if we have four adults in it, when it takes a bit to get on the plane (partly as i havent plugged the flooding hull)
I would def go for power tilt - means you can run the boat up the beach without having to run astern and leave the wheel.
good luck with it