[hpsdr] Sound card: M-Audio Delta 44, 66, or 1010?

[Jerry Flanders]

I am shopping for a sound card. I see the M-audio series is available 
in 4 channel, 6 channel, and 10 channel versions.

Delta 44 (4 channel): 
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=196845&is=REG&addedTroughType=search

Delta 66 (6 channel): 
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=196846&is=REG&addedTroughType=search

Delta 1010LT (8 channel): 
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=250599&is=REG&addedTroughType=search

Not much price difference between them. Would the 6 or 8 channel 
version work as well for SDR applications? It might be nice to have 
those extra channels available for other processing needs if there is 
no downside.

Jerry W4UK