Where do you plan on running...places like clear lake (which is half freshwater from what I remember), Galveston bay or somewhere else...just curious?
For a saltwater boat, a good coat of paint is good, powder coating is always better. Definitely need to keep a heat exchanger set up on the engine cooling system. I'd also add a freshwater flush kit before the raw water pump, and flush the engine after every use. A seawater strainer wouldn't be a bad idea either if you don't already have one. This may be a bit overkill, but if it was mine, I'd consider bonding (grounding) all metal components (rudder, strut, etc) together and installing sacrificials (zink anode) on the prop shaft and rudder. The key thing to remember, especially on a saltwater boat, is to stay on top of the maintenance, and take nothing for granted.
1998 MariStar 225VRS, 350ci LT1