For family use save yourself a lot of bother and expense and just get the largest HD TV you can afford/accommodate. To guard against obsolescence make sure that it has:
You will then have the choice of either using a minimal spec PC for your input (or any laptop) or if you have kids get them a Playstation 3. The latter has a great slideshow mode, plays Blu-Ray discs, Luminous Landscape downloads, etc. Actually IMHO worth the price even if you do not put a single game into it. Perhaps also the XBox. Probably the best TVs at the moment are the Sony offerings, LCD panels or the rear projectors. I have a 70" rear projection TV and with a Playstation 3 makes a great way of storing and viewing family pics. The 60 giga byte hard disc can store thousands of 1900 pixel-wide jpegs. That's the largest size you need for HD TVs. Some HD TVs even have card slots. If you insist on a projector have a look at the latest Sony offerings, but again make sure those 3 items above are present.