depends on what you're looking for.
if steelies or something similar; you can never beat Rough Country's customer service.
if northridge4x4 sells wheels; get w/ Dave and get some ordered. Dave at Northridge (any of them actually) is a great guy and easy to deal with.
4wheelparts is hit and miss for sure on customer service. go to your local store (if you have one) and see how they treat you... wait till the next major sale day and you might get a good deal on them to.