Hi,
I have the same guitar as you and I went for Mothers Milk, stock polarity, after some deliberation (see my couple of forum posts).
Sounds great. I play with just tube overdrive (no pedals when using my strat) and backing from 10 to 8 goes from dirty to clean. Amazing versatility, guitar sounds so much better - great string separation and classic strat twang.
Cheers,
Rich