After going through thousands of projector reviews, we found that most users look for these three qualities when it comes to buying the projector:

• Desirable features: For ease of installation and hassle-free projection, you should look for certain features like HDMI, which allows easy and instant digital connectivity. Other features, such as image correction, which helps to rectify a skewed image or wireless capacity for projecting without cables, are quite useful.

• The technology used: The main technologies that are used in projectors are DLP (=Digital Light Processing) and LCD (= Liquid Crystal Display). Both are good, but DLP gives a soft smooth image which is preferable for video applications. The LCD projectors are more appropriate for computer/data applications because they produce bright and sharp images.

• Warranty: There is a different warranty policy for each brand of projector. It is better to pay a little extra if you know that the manufacturer of your projector will respond to your distress call and solve any problems within 24 hours. 

• Consider the throw ratio: The throw ratio is defined as the ratio of the distance from the projector's lens to the screen (called “the throw”), divided by the screen width. A larger throw ratio means a more focused optical system. It helps you gauge how wide the image will be if you place the projector at a specific distance from the screen. If you want to permanently install the equipment, it is imperative that you calculate the throw ratio. In the event that you have a space constraint, you may select a short throw projector, which will allow you to place the projector quite close to the screen but will still display a wide enough image.

• Check the screen size: A rule of thumb for calculating the screen size of the projector is to calculate the distance of the “least-favored viewer”--that is, the distance of the person farthest from the screen--and multiply it by 1/5. For example, if the person is sitting 50 feet away from the screen, the screen size will be 10 feet high.

• Estimate how much ambient light is needed: The image should be clear and bright enough to be seen by all viewers. Under ideal conditions, a projector should be used in a dark room, because the more light means the lower will be the contrast, which will completely destroy the image. 

Epson: Epson, one of the leading manufacturers of projectors in the world, is known for cost-effective machines which boast of a number of useful features, such as high-quality images and the inclusion of latest technology.

Viewsonic: Three things define the high-quality projectors of Viewsonic: 1) color accuracy, which offers a more varied color range than conventional DLP projectors, 2) best overall projector warranty, and 3) smart design.

Source: https://www.bhphotovideo.com/explora/video/buying-guide/projectors

http://www.bestbuy.com/site/buying-guides/projector-buying-guide/pcmcat342500050003.c?id=pcmcat342500050003

http://www.toptenreviews.com/electronics/articles/home-theater-projector-tips/

http://www.purple-cat.co.uk/projector-guide

http://in.pcmag.com/projector/54041/guide/the-best-projectors-of-2016