Which decoder sounds to choose???

I looking to upgrade my "fleet" of locos to DCC. I've got Norfolk Southern SD70, SD40-2, and GP38 that I'd like to make sound cars for. I also have a UP F7A/B/B setup with a dummy B unit that I'd like to put sound in. I've been looking at the ESU - LokSound Select Micro line of sound decoders. Looking at the list of sound files confuses the stew out of me. Could someone help me decide which sound files I need for the referenced locos?

Thanks,
Ben

Ok, I think I've got this right...but any comments from someone with experience using these things would be appreciated!!

SD70M: 73410/73810
SD40-2: 73408/73808
GP38-2: 73426/73826
F7: 73406/73806

The Wag,
I don't have any experience with the decoder I do have a few in my N scale Engines but none in my Z scale yet. But I do Know some one who does install them for a living in Z scale his name is alex and he works at DCC trains in Cincinnati, Ohio and here is his web page. there not open every day but he is there between 1800hrs to 2100hrs on Mon.,Wed. and some times Sat. here is the link!

www.dcctrain.com/shop/