If you do decide to go this way - the 10HP machine will work. I don't know the relative pricing.
Mike - thanks for the heads up on these guys. I have not come across them before.
The rotary phase converter is about $600-750 as I recall.
I guess i lucked out on buying it as part of a package! I do remember when I had the electrician installing it, he opened it up and said "That looks expensive." I guess he was right.
Seems like you're not going this route, but for the record, the one i have is nearly silent except for a high pitched noise (like the sound old TV's used to make, but a little bit louder). The selmi vibrating table is much louder by comparison.