Judit,
If you decide to go with EAD, please research it a little.
It's a great pre-pro, one of the best in stereo IMHO, but older units had some annoying problems.
The best unit to get is the one with the latest 5.1 software and black VTF screen. I have blue screen on mine. It looks better, but harder to read and on some units they become noisy( my is quiet though).
Second thing is firmware version. With older units you may have pops and clicks with some DVD players.
You can read all this and more at EAD User group:
http://eadusers.cjb.net/ (go to Bug fixes, tips)
Good Luck