While we wait for other EVF solutions (RedRock where you at?), the Zacuto Z-EVF seems to be the hippest one available. Unfortunately, it's usually out of stock. If you've been on the hunt, the Z-EVF has shown up from a retailer out of new york, who has different models listed on both eBay and Amazon found below. They are also $50 dollars cheaper than from the Zacuto website. The difference in prices are relevant to the View Finder that is included. One is the more expensive Pro viewfinder.
Shortly after RedRock Micro announced their EVF - Electronic View Finder for DSLR's, Zacuto now has a complete web page and video showcasing their product. Actually they've gone as far as a complete domain name @ ZFinderEVF.com. It's still up in the air if RedRock Micro has an actual working version, but from the images that were submitted, it doesn't look like a finished product. Actually in this Video (above), Zacuto is also just showing a 3D model, so take this as just another announcement and not an actual product (yet).
Marketing is always ahead of technology and some people are speculating that the announcements were aimed just to be the first. Hopefully the products are released soon, as we've seen some bad turnouts on early announcements for products that never seem to make it to market or experience long delays. Personally it's all exciting, but I don't know if consumers really care who's first to announce what, it's more about first actual availability and pricing. I'd even take my chances on a no-name brand EVF if the resolution was adequate.
Redrock Micro is stated to come in around $600 dollars, and the Zacuto EVF just under $800. If i'm correct, you'll still need a Z-Finder to use with the EVF bumping that price up a few hundred more. This is something many DSLR shooters have been looking for and I feel they'll be set to grab whatever becomes available early on. Under those brand names, they'll both be well made products, but since Zacuto's will be several hundred more (including Z-Finder Loupe), time to market is what's really going to set the pace on EVF sales.
Another option would be going with the smaller 5" LCD monitors such as the Marshall V-LCD50-HDMI. Unlike the EVF's announced, the Marshall Monitor has additional features for setting proper exposure. I guess if you really wanted magnification for the LCD, you could just make a DIY loupe using a Macro Close Up FIlter and a box.
IKan also has a 5" LCD HDMI Monitor for DSLR's too.
Cinema5D's got the scoop on a new Redrock Micro 'Electronic View Finder' specifically designed for HD Video DSLR's. We all new this day was coming, but what I totally didn't expect was the expected price point. Wow, I really hope they can meet those goals, that's just ridiculous pricing for anything RedRock Micro. It looks very functional and I can see myself using that quite a bit. Today we had a crane shot on a roof of a building in broad daylight. It's was about 90 degrees out on a clear day, and we couldn't see crap on the monitor. Having a remote EVF like this running down a jib would have been a perfect solution. This design in remote View Finders via HDMI also means it would be cross brand compatible. Regardless of camera make and model, this should be fairly future proof. Zacuto has also admitted to be working on a new EVF, but so far nothing tangible has hit the web. Even if Zacuto does release an EVF, it would be interesting to see if pricing will be competitive with the new RedRock Micro Electronic Viewfinder. Check out the Cinema5D Video here: https://www.youtube.com/watch?v=FZYW1VwFdHk