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If you're serious about buying a Wilson, you might want to contact Joe S., who goes by "bloke" on this board. Rumor has it that he has a 5 valve Wilson 3100 BBb in excellent condition that he is trying to sell. Check his listing on bassclefbrass.com for details, or better yet, contact him directly.
The MW25 is a nice tuba but they don't pop up used too ofen. They sell for just under $4,000 new at most dealers.
The Miraphone 1291 BBb is a fairly new horn, so there aren't a lot on the used market. A place like WWBW or Dillons is probably your best bet for such a tuba. I don't think Baltimore Brass sells Miraphone, otherwise, I'd recommend them too.