I've got a wall in my new house, where the TV is. That's it. What I need to go through that wall today is three speaker cables and one S-Video. That RPTV is 8 years old. When it dies, it will be replaced with a front projector. When that happens this wall will have to be completely blank with only speakers and a screen. I'm thinking of putting a (double?) outlet box in next to the outlet there, with three sets of speakers and a hole for the S-video. Problem is that when I upgrade to a front projector, I'd rather have three single gang boxes, each right behind a speaker. Guess I should just do that now with a single box in the center with holed for one speaker and S-Video. Here's what I've put in the ceiling for the as yet not mounted rears, from Parts Express. Advice please???????