Plug In Decoder For Athearn CF7?

[FCIN]

I have two Athearn CF-7's that are "DCC Ready" and since both of them run very well on straight DC, I'd like to convert them to DCC. Can any of you fellows that's been into DCC for a while recommend which plug in decorders I should look into for this? At the moment, I'm not looking at installing sound in these models, as I really haven't looked inside the Athearn shells to see if I'd have to make a lot of modifications.

Your input is appreciated!