Sergio - if you've been advised to use a projector with the requirements you have set forth, you are being advised by idiots.
During 'normal' lighting conditions - after dark, but with ambient light, you will need about 50 lumens per square foot, and I would expect a screen size in the range of 40+ feet wide, which demands around a 20,000 lumen projector. Think $100,000 or so for the right projector. For NIGHT use only, with some typical ambient light.
Stadiums - let's be clear here... Stadiums drop $250,000 without any sweat, on the displays they use as a baseline minimum.
When they use projectors, they use rear projection units in fully enclosed structures, and tend to only do this within indoor venues. No stadiums use projectors outdoors that I've ever seen. Instead, they go with LED signage, which is FAR brighter, modular, and designed to withstand the elements of outdoor use. As well, they can be custom fit to any size at all, to create phenomenally bright and sharp display setups.
You are going to have to significantly adjust your expectations, or requirements, or budget, if this is the direction you plan to go. I would also consider that you can get a really bright 4:3 projector for a fair bit less than the Barco.
http://www.projectorcentral.com/Sanyo-PLC-XF47.htm
$30,000 (no lens) and delivers 15,000 lumens. You can likely find it for far less, and get the lens you need for your application(s). But, this still requires you to reset your requirements to no use during daytime/outdoors.
