Please give me a shout from "yourrealemail", willya?
You have several things that should be discussed and considered, but most do not have a bearing on this thread's content. I design complete Home Theaters, and will be glad to offer you some specific "free" advice as to how to best utilize your wall as a screen surface considering the light output of your Z2.
The Z2 has DVI In & Component In, so you want to avoid using any gear with HDMI output. Otherwise, you'll need adapters or Changeup cords (HDMI to DVI) and those critters will up your budget. Not only that, but often, the Z2 will not show up as being HDCP compiliant to the DVD if such has a HDMI output. It is, but the crosstalk between the two pieces can get jumbled sometimes and then.....no image.
I hope you got a decent ceiling Mount. That's a real important part of it all, as are the cable you buy. I can steer you toward some Wholesalers of excellent cords, but such cannot/should not be done on-Forum.
If you haven't bought a DVD as of yet, get an Oppo DVD. ( http:www.oppodigital.com
) It is the finest DVD player under $200.00 in the world, BAR NONE! It has DVI out, outputs simultaniously via the Component outputs, is rated tops in the whole wide world against $3000 DVD players in recent tests, and is upgradable via free DVD Firmware update sent by the Mfg direct to you. Don't pass on it, for it alone will make your project worth it's effort when combined with the Z2.
Silverscreen is an applicable choice, and many find it quite acceptable. You do need to consider your options carefully however. Using a wall, with the right paint scheme, you can easily shoot a 54" x 96" image (110" diagonal) up there and get the very most out of your Z2, DVDs, Games, and HD-TV I've done 122"ers with the Folks sitting only 10' away and have had nothing but great response.
THATS Imax-style viewing, and still completely within your budget. Done rightly, the Z2 can handle the above like you wouldn't belive.
Welcome to the DIY Forum, and our Mad Little Company.