As far as I understand, the Domobar Piccolo is a much better coffee machine. However, second hand prices for Silvia are about $500-$600, whereas second hand Domobar Piccolo go for about $1200. Thus, you are not really comparing apples with apples here. Perhaps a fairer comparison would be a with a Silvia equiped with a PID. They are second hand about $850 or so.
I suggest you visit one of the site sponsors to see machines "in the flesh".