I'm not a big fan of the all black rim look, nor do I care for the Gobot look of most modern truck rims, but to each their own as this hobby is all about personalization.
IMO, the biggest hurdle with that option is that getting truck rims in the right bolt pattern will be almost impossible, or at the very lest, very expensive. Trucks are, for the most part, are going to have bigger bolt patterns or more bolts, like the 6 lug pictured.
IMO, $550 for a pair of rims aint bad when the really good units are runing upwards of $1000 per. However, it all depends on how you wanna use them. If you want some inexpensive rims, maybe look at the Jegs or Summit house branded stuff. If you're really set on all block, Cragar or Weld may have some options.