I purchased the Panny PT-L300U site unseen because of reviews and feedback from Projector Central. I think they have really pushed things forward with the AE700 by adding lens shift and if they follow through with their typical Panasonic quality then you can expect an incredible image. One of the best values for your money for sure.
The projector really is the same type of unit that is put into rear projection televisions, but I believe they try to jack the light output up so it covers a larger screen. It makes the bulbs blow faster, but you can go with a bigger image. I would not really consider the bulb hours predicted as ANY indication of actual bulb life. If the bulb really laster 3,000 hours then it would have more than a 90 day warranty on it. Just get an additional bulb from the beginning and be happy with that.
A good screen will last you many, many years. You may wish to get your projector and see how bright it is before deciding exactly what type of screen you want, especially if you have a white wall. That will help you determine how much gain you want for your screen and whether at some point you would add a supplemental display device (plasma). On wall fixed screens are excellent, but there are also tab tensioned retractable screens that have about the exact same performance as fixed screens. A few nice things about retractable: You can build it into the ceiling or extend the ceiling around it so that when it is not in use, your A/V system basically becomes invisible. You can put artwork on the wall behind the screen and actually have a nice looking wall when the PJ is off. They are electric so they can be tied into the receiver or projector power to come on automatically, no extra remote. You have about as many screen material choices as you do with fixed screens. Downside? More expensive.
Anyway, if you aren't in an all-fire rush to get everything done at once, you can get the projector in, hook up a DVD player easily and see how it looks in the worst of conditions before dumping $1,000.00 or more into a screen.