I'm about to buy an entire system. I need to know what to look for? Some salesmen say get a TV with HDTV built in and your ready for the future, while others say get HD ready so you can upgrade your HD tuner as advances come along. Which is the correct path? I found a 61 inch RCA with built in HD and Dish Decoder, It was going for $3200, But I like the Mitsubishi sets a lot even though I would have to buy the HD converter separately. What Should I look for to get absolutely the best system on the market for $4000 or less?? And what's a really good surround sound system?