Fender Guitars.

I love P-90's. They're becoming my favorite pickup for everything except metal.

Proper shielding always helps reduce unwanted noise.
 
Shield everything. In a proper environment it won't make much difference, but... you're a guitarist. You don't get proper environments. You're lucky when you have a gig where there are more heads than carcinogens between the walls - do you think anyone does the electrical work sober anywhere you're playing? Unless you've got power conditioners for your power conditioners and Nikola Tesla has wired your stage, wrap that guitar like you would your hairy banjo in a whore house in Bangladesh. You'll thank me.

Jeff