Silvia is not really an ‘upgrade’, it’s got the same shortcomings. Fine for knocking out a few espressos a day, but struggles if you need to make a few drinks in short order.
The classic is very good, adjust the pressure to 9bar (it’s overpowered from the factory), even fit a PID controller to really get the best out of it. Upgrading your grinder would give you much more bang for your buck.
I’ll believe the nespresso hype when I see them being used in bars. It’s alright, a step up from instant maybe, but appalling espresso.