Your setup isn't that complex. The room really doesn't need a short throw projector, and it is best to use LCD in a mixed use conference room for their high brightness with color content.
The screen is obviously pretty outdated. It's never going to be the correct aspect ratio and you will never use all of it. In fact, your higher resolution request, without a larger screen, will make text much smaller than it currently is, but should give you some flexibility if you move up in screen size in the future.
The wireless request is a joke.
I think this is said several times a week, but here it is again:
Streaming video at 60fps which is typical computer monitor refresh rate requires a network capable of supporting about 3Gbs. That's 3 times faster than a wired gigabit corporate network... Per video stream.
To achieve wireless, you push things down to 3-10 frames per second, and you give up a ton of image quality. They do have point to point HDMI transmitters, and products like ClickShare from Barco which are ridiculously expensive. On top of that, you have huge compatibility and reliability issues to contend with. Some PCs work, some do not. Mac vs. Windows, Dell vs. HP. Most of the time they work, most of the time they are fine for PowerPoint. But, videos suck almost always, and that 20% of the time they don't work, it presents a significant headache for technical support and may severely disrupt presentations.
Having wireless AND a wired connection is a must for reliable system operation. There are plenty of wireless options out there, most of which equally are so-so. But, add that wire to the front of the room or conference table, which allows for a presenter to make a hard wired connection. It will save you headaches and nightmares.
On to the projector... Your screen is about 79" wide. Less than a 100" diagonal, which is pretty small overall. The screen surface area is about 28 square feet in 16:9 format, and only needs about 3,000 lumens to properly fill the screen under normal florescent lighting.
All projectors can be ceiling mounted, so that's not an issue, and I will assume you can put the projector anywhere along the ceiling and several inches above the top of the screen without a problem. If you have more specific placement issues, then you may need to pick a different model, or enter that in the search criteria.
Shows LCD 1920x1200 projectors which fit your price range. There are none that I would object to, but I lean towards Panasonic for long term reliability. Still, Epson, Sony, and Hitachi are all fine products.
If you do need some height adjustment, then you will need vertical lens shift, which is an option for the search criteria...http://www.projectorcentral.com/projectors.cfm?g=1&hide=0&st=1&mfg=&p=300&p=3200&w=&r=16&br=&ll=<g=&t=&db=&dt=1.0.0&c=&ar=&dvi=&wr=&vls=1&pjl=0&pjw=0&pjh=0&td=&is=&i=d&tr=&oop=1&sort=pop&sz=15
It knocks a few models off the list, specifically the cheapest models.
If I were to recommend a single model, this would be it:http://www.projectorcentral.com/Panasonic-PT-FZ570.htm
It offers extensive zoom range and can hit your 2m wide screen from 8' to 14'10" away (2.4m-4.5m). If installed at about 4.3m lens to screen (towards the back of the room), then you could increase the screen size in the future to about 3.5m wide maximum. About 2.9m wide (133" diagonal) would be about as large as I would recommend.
It has the brightness, good zoom range, horizontal and vertical lens shift (great placement flexibility), two HDMI inputs, wireless options, HD-Base-T integrated (awesome!), and a price point in line with your budget (at least here in the US).
It's a newer model design with the latest features, a lamp rated to 6,000+ hours, and a 3-year warranty.
- Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.