Can you tell which is these are good projectors:?

Toshiba TLP 510 projector & Optoma EP716 HD Home Theater DLP Projector
They are asking for about $350-$450.. Let me know if it is a rip off!

Even though the Optoma EP716 has a 2000:1 contrast ratio which is excellent for viewing DVDs and games, the 2X [...]

Features of the Sony VPL-VW60
For people who are planning to create a reliable and high performing theater system inside their homes, they may find the Sony VPL-VW60 Black Pearl very appropriate and highly dependable. With a contrast ratio of 35,000:1, this particular Sony projector has doubled the resolution of its predecessor, which is the Sony [...]

Sony, well known for its innovative Electronic products aims to fully leverage this uniqueness in aggressively carrying out their convergence strategy so that they can continue to emotionally touch and excite their customers. 
Sony has released a projector in BRAVIA series — VPL-HW10 that features a new and stylish design, triple-panel Sony SXRD and 8-stage image [...]

Party/Projection Screen Question?

For my sweet 16, i want a montage of photos of me. i already have the projector, but i need the actual screen.
i was wondering if this screen was decent for like 120 people to see:
http://www.projectorscreenstore.com/Da-Lite-40-x40-Versatol-Tripod-Projector-Screen-p/89060.htm
and an estimate of how big something 40×40 is?
sorry if this was confusing

This screen may be a little [...]

Which projector is better for movies/games?

This one http://www.projectorcentral.com/play_big_IN72.htm
Or this one http://www.projectorcentral.com/Toshiba-TDP-ET10U.htm
I know that neither of these are high quality, but I don’t really care. What I mainly want to know is, how will the quality of the images look on games/movies. My old tube TV is in 480p, and it looks [...]