I don't understand the Dell reference, however..
The best value is going to be a DIY screen. Since you're not intending a very "tall" screen, you can easily buy the blackout material and paint it.
In general, I would recommend first getting your projector -- and then later buying the screen once you're sure of placement and the like. Use a bedsheet for the first few weeks, its cheap and you'll know exactly how big you want the screen to be.
Roo
The best value is going to be a DIY screen. Since you're not intending a very "tall" screen, you can easily buy the blackout material and paint it.
In general, I would recommend first getting your projector -- and then later buying the screen once you're sure of placement and the like. Use a bedsheet for the first few weeks, its cheap and you'll know exactly how big you want the screen to be.
Roo