A Scaced Diadema Perfetta or VBM Domobar Piccolo will take you to the next level and is a deadly shot machine. You still have a delay for milk and if you want to avoid that, you need to look at dual boiler or HX. Ultimately, it comes down to your requirements.
I dont personally believe that a high $$$ PID is a particularly good investment on a relatively inexpensive machine as the spend will be pretty much lost upon resale.
Perhaps look at a Compak K3 Push over a Rocky. Its a superior and quicker grinder for a similar price.