And that's all you really need to know. Like you've correctly stated above, early 6L's had issues and with oil prices up, fuel guzzlers are going for far less than at any time in the last 5+ years.
Like you said, keep looking and remembering there's no excuse to overpay in today's economic climate.
People are paying crazy money (IMHO) for 2000-2002 7.3L with almost 200K miles. On Ebay they are selling for almost $15K or so. Seems pretty high to me.
The more I think about it - the V-10 makes sense. Cheaper to buy, and cheaper to fix. It should do everything I need it to do.
D.