Does anyone have a recommendation for a truly accurate audio interface?

Currently I am using the Sound Blaster X-Fi Xtreme Audio Notebook
express card to take audio files.
http://us.creative.com/products/product.asp?
category=209&subcategory=669&product=16642

I spoke with Dan this week and he likes the Sony PCM D50 which is a 24
bit 96K unit with a freq resp of 20 Hz to 20 kHz.
http://pro.sony.com/bbsc/ssr/product-PCMD50/

Bill likes the Edirol series, they make the R-09HR which is a 24 bit
96K unit with a freq resp of 20 Hz–40 kHz (±2 dB)
http://www.edirol.com/index.php?
option=com_content&task=view&id=332&Itemid=390

Currently I am working with manufacturers to have a device just for
this application.