The 200 vs 250 vs 400 issue has been covered in the past, see link for easy reference.
http://devialetchat.com/showthread.php?tid=813
http://devialetchat.com/showthread.php?tid=813
1000 Pro - KEF Blade - iFi Zen Stream - Mutec REF10 - MC3+USB - Pro-Ject Signature 12