You can't go wrong with any of the forged piston manufacturers (JE, ROSS, Venolia, Arias, etc). You just tell them what you have, what you want and they'll make them up $pecial for you;)
As far as rods, I have yet to hear of anyone destroying the stockers with a properly tuned motor, so they are good for 400+ rwhp I would say. In most cases, you'll want to have them prepped (magnafluxed to check for cracks, resized crank ends, and then the rod ends drilled and bushed for the floating pins that will come with your forged pistons). An exotic rod (like a carillo, etc) is probably unnecessary unless you are shooting for the stars in horsepower.