I think there are a few all-in-one projectors with tuners built in, but they don't tend to be great performers. Usually have speakers/DVD etc built in too and are only SD. More a convenience choice than a performance one.
What are you planning on using it for, a total TV replacement, or more occasional use ? Do you have a screen already ? Looking for HD ?
Sorry for the questions but I've been doing alot of PJ research lately so I may be able to help