Just about any good video projector on the market these days will give you a great image. And ALL will connect to a PC, Mac or video player (VCR, DVD sattelite, cable box, camcorder, etc) and even some portable storage devices like FlashTrax or your digital camera's video out jack.
Names such as Epson, Canon, InFocus and Sanyo are all good. Office supply stores and computer stores sell them since they're a popular business-presentation tool.
Look for something at least above 1200-1600 lumens (a measure of light level) but don't get too caught up in a numbers game of a couple hundred here or there. Definitely look for 1024x768 resolution or better. Many (but not all) sub-$1000 projectors only have 800x600 pixels. To appreciate all the detail your pictures have to offer, buy the highest resolution you can afford.
If you intend to carry it about, go for lightweight, but understand durability is a tradeoff. Bulbs are expensive and not always user-replaceable, but you do get a surprisingly long life out of most.
Oh, at the end of the day, they are GREAT for watching your favorite movie on, too!