Well you have 4 vary nice projectors on your short list. The AE900 and the Mits HC3000 have a slight advantage being the latest produced and have the latest color/software going for them.
From your short list I would narrow it down to the Mits (dlp) and AE900 (Lcd) and between the 2 you really need to see the AE900 because of it's smooth screen technology(it softens the picture sharpness to eliminate the screen door found on LCD panels). This softer focus bothers some folks so you really need to see it and deiced for yourself.
Now as for the DLP if you can see the Mits great, but if not almost any of the newer 720 DLP's will get you in the ball park of sharpness, every DLP I looked at from the lowest price up the 15,000 dollar units had the same film like look and sharpness, as long as they were set up right.
Don't worry about Contrast levels (blacks) for a demo, contrast has a diminishing return after 2000:1 the difference above that level is quite small and usually can only be seen in a side by side showing, NOT that you can't tell, it's just vary had to see especially if you have to travel form one dealer to another. Sometimes the room/lighting/screen around a projector will make it look better than another when it's really not.
Last but FIRST on my list is PICK THE BEST DEALER, research them as much as you did the Projector.
Hope this helps a little.
From your short list I would narrow it down to the Mits (dlp) and AE900 (Lcd) and between the 2 you really need to see the AE900 because of it's smooth screen technology(it softens the picture sharpness to eliminate the screen door found on LCD panels). This softer focus bothers some folks so you really need to see it and deiced for yourself.
Now as for the DLP if you can see the Mits great, but if not almost any of the newer 720 DLP's will get you in the ball park of sharpness, every DLP I looked at from the lowest price up the 15,000 dollar units had the same film like look and sharpness, as long as they were set up right.
Don't worry about Contrast levels (blacks) for a demo, contrast has a diminishing return after 2000:1 the difference above that level is quite small and usually can only be seen in a side by side showing, NOT that you can't tell, it's just vary had to see especially if you have to travel form one dealer to another. Sometimes the room/lighting/screen around a projector will make it look better than another when it's really not.
Last but FIRST on my list is PICK THE BEST DEALER, research them as much as you did the Projector.
Hope this helps a little.