I have a 5D and a LCDVF. I want to upgrade to a EVF. The Zacuto EVF is of course what everyone talks about and the most highly rated, but theres a cheaper one call "Cineroid EVF" that I hear good things about. I like the universal mounting for them, however I don't like the fact that on the 5D the screen res bumps down to 480 4x3. I'm not complete sold on the idea but highly considering.
"this has a tilting 12" hd lcd with built in dolby 5:1 surround as well as a red velvet collapsable chair that folds into the battery grip and a small asian who lives behind the sensor and makes you popcorn. it's the same asian who cleans the sensors on all of canon's sensor cleaning bodies so it's not that revolutionary"