More sigs. Credits to MrJinggles. (Dug these from the V1 thread.)

Removed 'cuz the 3rd post is now updated.

This post has been edited by Agnaem: Apr 21 2012, 10:23 PM

Headfonia
Head-fi

My opinion, if you're looking for an upgrade, 661 is more of a side grade; unless the practical reasons have much significance to you, like portability.

P/s: Opinion formed from reviews. Didn't have the chance to test a 661.

Review for 386 is well, nonexistent? Can't find any.

I'd try 386 should my 381F die.

flare66

See if these helps.
Superlux review(330, 440 & 660) @ Headfonia
Superlux review(661) @ Headfonia

Look for closed-back cans since you're using it as a portable. e.g. 660 & 440.

My conclusion from the 2 reviews is 661 is the more practical choice for portable, having 1m straight cable vs 3m coiled cabled, smaller size and so on. 661 loses in sound however, but is still a very good portable.