Find one that is a performance friendly. That's what i wound up doing for my water pump replacement. Brought it to one dealer and they refused to work on it so it sat there for a week. Called the dealer i bought it from that does lifts and EFI live tuning and they had it in and out in a day.
yea the orig dealer i brought it to was a bunch of asshats and said they couldn't work on the truck under warranty b/c there was no EGR system on the truck, yet they offered to fix it if i was willing to pay. \
I would say just look for dealers that have some modded trucks on the lot and ask them.
What about the dealer the truck was purchased from?