Well if worst comes to worst you can use something like this site vixy.net : Online FLV Converter : Download online videos direct to PC / iPod / PSP. It's free!. I don't really have any experience with FLV converters but there are a lot of hits on google. This is just one of them.
Just one other option to add to your current list.
Edit!
Finished testing the site. It works pretty well from the test I ran on it[used file I had an AVI[not a high quality one... but not horrible either] to as well as located it on youtube. I had it convert the youtube version and it came out just fine].
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