I looked at the Sweet 16 and the Tin Lizzie sit down models. I ended up with the Lizzie. I've had really great rep support. She has been to my house 3 times (long story, solved now) and the machine stitches wonderfully. I love the machine and it's cheaper than the 16. With the difference in money, I purchased a Juki 2000 which I absolutely love.
I chose the Lizzie sit down instead because I liked the machine orientation, side to side like a home machine so that if I needed to move the handwheel, I would not have to get up and walk around the back to do that. I'm not sure what is available across the western pond but if you have the Lizzie option, I'd compare the two.
There is a yahoogroup full of happy Sweet owners. Everyone I know of that has had a HQ machine love theirs