memo,
The only real diff between the 44 and 66 is that the PCI card for the 44 has no S/PDIF i/o and the 66 does. Seems that for $20 difference it's probably nice to have even if right now you don't envision needing it. You might want to rent a DAT someday and do some field recording, for example -- with the digital i/o you can send it to the PC in the digital domain without converting to analog first.
trucker dave,
Just asked you a couple of questions in another thread that you mostly answered in this one... very encouraging to hear that you had no trouble with getting the Sound Blaster to coexist with the Delta 66. I am really jazzed and can't wait to get this system all together!