What sort of price point are you looking at? For my session work when I need 8 channels of high-quality A-D, I use Lavry Blue converters. It is AES on XLR out, but the purchase of an XLR-Dsub cable should be a non-issue. When I needed 16 channels of A-D at a price point, I went with a Lynx Aurora. On a good system, though, the differences between converters are pretty audible.
There are tons of great boxes out there, but the big issue is how much do you want to spend. Do you want to spend Apogee or Lynx money, Lavry money, Prism money or Meitner money?
--Ben