Cool Will probably just go with the rocky. The Baritza vario reviews are more mixed, some fantastic some very poor, while the rocky seems to get "this is the minimum grinder you should ever consider, it sucks but everything else for around this money or less is far worse and not useable".
Can you just buy or DIY the PID mods? Where I I tend to buy I can get the do done for $150 but that seems very high and I wouldn't mind the challenge of making a little circuit myself and running the PID gains.
I bought mine ready made from Auberinstruments on ebay, but yes, you can buy the components and build it yourself. I'm too lazy though and liked the ready assembled kit. Actual fitting is a doddle, although I did wait 12 months before doing it. Cost with the steam control too was about £120 or so.