For the 1.6, I've been trying to get together a custom supply design relying upon a 5v supply.
I asked for what I needed on an electronics forum, and they quickly responded with this:http://www.edaboard.com/thread256425.html#post1098768
If you aren't afraid of building circuits, and trying something as of yet untested, that could certainly be worth a try. Depending on how you source your components, I think it's between $15 and $50 to build the circuit, and then you need to come up with a 20-25A 5v supply (100W-125W) This should be fairly simple to come up with if you aren't worried much about looks of it, and just mod a PC PSU.
It has the advantage of not relying upon hard to find converters, and not having half of it's voltages not matter.
Just a hint, TI will let you sample a few products of theirs, so you can know if it will work in your designs... May be worth looking into. This post has been edited by ttsgeb: Jul 14 2012, 12:17 AM