It's your money, Chaz, so it's very easy for us lot to give advice! However, that link in your last post looks to me a better option than the original one, mainly because it's better equipped. Transport could be an issue, of course, but that's going to be the case for most of these unless they come from a dealer with their own transport. I had my (2800lb) lathe fork-lifted on to a hired flat-bed Transit and arranged for a friend with tractor and front-loader to take it off for me.

Again, because it's all got a bit rambling and confused, my own preference would be for a decent second-hand machine rather than a new Warco. Purely my personal choice, and I'm happy that I went that way, even though my machine still needs a bit of work to get it working absolutely 100%.

A 4KW VFD should be enough to drive any of these machines, as long as you can rewire the motors as 240V rather than 415V (probably wired as 415V as standard). I'm assuming that your VFD is 240V 3-phase; chances are that none of these lathes are going to have bigger than a 3HP or so motor which translates to 2.2KW, well within capacity.