It seems that the 2 suggested projectors from amazon are lamp projector. lamp projector life time is very short. in general, you can play 1 or 2 years and it's image will become unclear. It is very expensive if you replace the lamp.
Now new trend is DLP LED projector. Long life time at least...
the new trend for projector is US DLP LED projector. It is using DLP Led that can play 20000+ hours. For general use, it can support 10 years. I just bought and it is very light weight.