Boogs, what's the interim goal with wheels/tires?
Are you wanting to get the 15" with whitewalls on there now, or are you just looking for rollers while you're working on the truck?
Until you're ready to swap out the front suspension, just go cheapo until you settle on what you really want for rolling stock. There's plenty of decent cheap stuff in 16.5"... I put Yokohama white letter Geolanders on my trucks, and they've taken a beating.