I've got a passive Fender Jazz 5 which I love. It's got a great passive vibe. But I was thinking..... what is the best way to get active electronics with it? Should I go on-board with something like a J-Retro (if so, could I install myself?), or go out-board with something else? What is the best in value and sound? IMPORTANT NOTE: It is very important to me to still retain the ability to go passive. That would mean "active/passive electronics", right? Thanks so much in advance.