If you're looking for a smooth natural sound, the Paradisea can't be beat for the price. There haven't been any significant changes to the circuit since the first model. Some people like the sound of the op-amp in the original model better than + and 3 version, so you can save a few bucks if you don't need USB. Many folks "upgrade" to the older op-amp (Burr Brown OPA2604).
These comments from a side-by-side comparison with a Havana should be worth something:
http://www.audiocircle.com/circles/index.php?topic=33534.0
These comments from a side-by-side comparison with a Havana should be worth something:
The Paradisea+, though not "technically" as fine sounding as the Havana DAC is still ... VERY VERY close in character and sound quality.You'll find 39 pages of glowing comments at this lengthy thread:
http://www.audiocircle.com/circles/index.php?topic=33534.0