Assuming you're limited to 4 balls with traveling, I'd try to use your Pitch Black as a spare ball or even eliminate the Pitch Black so you could take 2 of those options. From what I've seen and heard, urethane might only be an option for the heavy handed or 2 handers.

I'd probably go with the IQ Tour Solid and Torrent. If you're set on just 1, the IQ Tour Solid

Thank you for the suggestions.  I like the idea of using the Pitch Black as a spare ball (because it allows me to keep it in the bag), but I need to practice with it first before making the final decision.

Current Bag:

RG Menace
Storm Torrent
Storm IQ Tour Solid (pin down)
Storm Pitch Black or Lane 1 XXXL

Let me throw another wrinkle into the mix...amongst the people that I bowl with I am known as a ball whore.  I have too many balls to list as potential options, but I will name a few and let you decide if they are better options that what I originally asked about.  Feel free to suggest any surface adjustments.

Other choices:
Roto Grip Critical Theory (OOB)
Storm Code Black (OOB)
Storm IQ Tour Solid (pin up + would take to 2000)
Storm Hy-Road (3000 grit)
Storm Wipe Out (1000 grit + polish)

Thank you for any suggestions or comments.

Hey quazyguy, out of curiosity where did you hear the IQ tour is about to be discontinued?