I have the Bernina Activa 220 and also the 630E. I LOVE, LOVE, LOVE the way the 220 sews. For a compact machine it has a LOT of features: needle up/down, needle threader, and the optional knee-lift being my favorites. It comes with the shank adapter and 5 snap on feet, but it uses the standard one piece feet as well.
It is more expensive than the Janome Jem, but the Activa is so nice and has so many features that I do not consider it strictly a "portable" machine. It sews just as nicely as my 630, and has a smooth, powerful feel to it. The 210 model sews just as nicely, but for the money it really is lacking many features. I'd spend just a little more money, for a lot more machine.