A proper screen makes a huge difference for the picture quality from your projector.
Prices vary enormously, with various shapes, motorised systems, and gains to match all room layouts.
A decent 7' motorised or fixed acreen will start around £ 1000, while a full masking Cinemascope screen can be price you want.
Choosing the correct size for your room and matching it to the level of your projector is the right approach.
Brands such as da-lite make great screens at reasonable prices.
High end screens by Screen Research and Stewart Filmscreen are a delight as the quality of construction and the attention to detail is amazing.
For an integrated design do give me a call and we can design the complete installation to thrill you woth the end result.