Plus, the 3700/3800 has a great D/A converter. Definitely one of the best quality D/A built into a home DAT deck, and undoubtedly a big step up from the D/A in a DA20MKII.
Only negative with the 3800 (and I believe the 3700) is that the transport is engaged whenever the deck is on - i.e., whenever you leave the deck on, you are putting hours on the heads - so if you're not using it - turn it off!
Also - I'd check the hours count on the heads before purchasing. Its easy to do on the 3800.
-Dave