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I think I found my Dana 60 on Craigslist, but that was years ago. It might be worthwhile to buy a donor truck so that you have all of the suspension and everything. That stuff can get expensive quickly.
What year axles are you looking for 99-04 or 05 up axles and out of curiosity are you anywhere near Missouri. As I have couple complete rolling chassis for 99-04 if your interested.
Second the RSK. Don't forget drop pitman arm and drop track bar bracket, or you will have noticeable bump steer. I gather the 250 solid axle swaps require new front springs anyhow, so this is the time to do RSK with Superduty springs.