Spotted ecost.com offering cheap factory refurbished Sony noise cancelling headphones. Got a factory refurbished Sony remote control from them last summer, and it was cheap and in pristine condition - no complaints from me!.

http://www.ecost.com/ecost/shop/detail.asp?DPNo=286036 - MDR-NC5 for 33 dollars delivered + tax

http://www.ecost.com/ecost/shop/detail.asp?DPNo=191096 - MDR-NC11 for 64 dollars delivered + tax

I was fancying the cheap ones, but now I'm tempted to spend that bit more... grr!
Has anyone tried them both? Is it worth spending twice as much on the more expensive model, or should I just stick to ear plugs and ask for bose this christmas?