audiophile grade sub panel and breakers?

I’m reviving an old thread. 
I’m having a sub panel installed so I’m thinking I’ll go with the above mentioned Square D panel with copper bus and the QO silver circuit breakers. Anyone have any model numbers they recommend?
My electrician mentioned a 60amp but don’t see any 60amp, should I just go with a 100amp just in case I ever add to the room? They don’t seem to be that expensive. 
He’s also installing a new 8’ ground rod specifically for the sub panel. He mentioned he would use a insulated wire for that. Which would go from the ground rod to the sub panel and then (I think) to each 20amp outlet. Is there any recommendations for this?

Also, I was looking at the Square D panels mentioned here but this is an older thread I was told that Siemens PL series was a good one as of now. 

I I probably did misunderstand him. 🤷🏻‍♂️
He’s actually very qualified and knows a lot about getting the best AC to my room. 
He mentioned another product that said would clean up the entire house but I’m not sure what it was just yet but it wasn’t the Environmental Potentials product. 
I’m waiting to here back about that.