I ordered a Rancilio Silvia V5 at the end of November. This arrived from Italy about a week later, complete with conversion plug. I now understand that this was, in fact, the V6 (the newest version), although I'm afraid that I am unaware of the difference between the V5 and V6.
Having said a fond farewell to my original Gaggia Classic which had just got beyond economical repair, I can confirm that the Silvia is a worthy replacement and produces a superior brew. It took a few weeks to get the machine run in, but it now consistently produces a good crema, even on the first pull. The milk steamer is amazing, and the steamed milk follows the coffee down the cup, with a wonderful texture.
I imagine that this machine will get even better over time; I am very pleased with my purchase.