I've never heard a Gustard but I stepped up early on to a Chord DAVE and indeed it provided the detail, realism and accuracy that you describe. My DAVE will be listed for sale as soon as I get around to it as I have moved to the next level with a Lampizator Golden Gate 3. The soundstage is astounding. the sounds you hear that have never been resolved before will have you looking up and smiling. The DHT preamp section will make the music sound more real, more close and just immaculate.
So if you're the kind that likes to upgrade, save yourself some money and upgrade 2 steps at once.
Jerry