Hey fellow Cheesehead (Racine, WI?) - apple juice (and with part pineapple juice too) is the way I love it. I actually brine my pork butts in applejuice/water/pineapple juice, salt, pepper, garlic, onion powder, allspice berries, celery overnight. I had tried injecting it then, but wouldnt take anymore liquid
Rub it the next day with a good rub. Lay some good bacon (Held's) on top. I smoke it w/ Apple & Hickory blend, and for liquid I use a fresh batch of the brine, and spritz it every 30 minutes (after the first 1.5 hours of no-peek) w/ apple & pineapple juice. Turns out great!