I'm thinking of getting a projector, to use outside. I have no previous experience with projectors, so was hoping for some advice on what to buy, or what to look for/beware of. I want something 1080p, portable, so I can quickly and easily take it down and store it indoors, and I'll be projecting onto a screen about 92 inch. I'll be using an hdmi input. And lastly, do projectors just have an audio out to go straight to speakers?