Bob,
A word of caution. I thought long and hard about the add-on lathe. It was in the mix, out of the mix, back in, and finally out. In retrospect I am glad that I didn't buy it. Ultimately it's a rather expensive mini-lathe. I asked the question as to whether it would be happy turning stainless steel, and got a non-commital reply, which I took to mean not really. The screwcutting is quite clever, but nevertheless a substantial compromise. For short work it is better to mount the work in the spindle and use the mill axes to drive the tooling.
Of course the usefulness of the bolt-on lathe may depend upon other equipment that is available. I find that a manual lathe with capstan and a hydraulic copy unit, and a repetition lathe are far more versatile.
Generally Tormach read the market pretty well, but my personal feeling is that the add-on lathe wasn't one of their better ideas.
Regards,
Andrew
PS: I did buy the 8" 4th axis rotary table and it has proved invaluable. Oh, and buy more spindle tooling than you think you'll need.