I can't comment on any of the lathes you've mentioned, but I have this lathe, and find it fine for turning pens. Axminster Hobby Series AWSL Woodturning Lathe - Woodturning Lathes - Lathes - Machinery | Axminster Tools & Machinery
I started of with a small second hand Jet lathe, but it had a vibration that I couldn't get to the bottom of. I bought the Axminster lathe as it was one of the cheapest I could find, since I didn't want to spend a huge amount just in case I was the problem! I'll probably upgrade it over the next few months, as I'd really like something a bit bigger and with variable speed, but for the moment this one does fine.