I am finishing my basement and plan to install a retractible projection screen inside one of the soffits. I will have a plasma on the wall for regular watching and then, potentially down the road, would like the ability to drop a big screen and turn on the projector. I want to buy and install the screen now before the drywall goes up. Have been investigating projection screens and can find electric versions ranging from under $400 to over $4,000. I don't need (or want to pay for) the best, but also don't want to make a bad purchase and have to replace it. Please advise a projection newbie on how to make such a decision and hopefully save some money in the process. Thank you.