Op amp capacitor value question
You can use any value you want. 

A larger value will extend the low frequency bandwidth, however it will also  make power-on settling longer. 

At power on, this cap needs to charge to its DC operating point. This takes longer for a larger cap, so you will get a larger and longer turn-on thump.

"Longer" can be... pretty long (check comments below).

Same remarks apply for output cap C4.