Thank you all for your input!
Just went through all the options with my rep at Forgeline based on my measurements and other comps. Super impressed with the time they take with you in getting things right.
Looks like I'll be going with:
Rear: 18" x 12" (7.5" Backspace)
Front: 17" x 8.5" (5.5" Backspace)
Continental Extreme Contact Sport
Rear: 335/30 R18
Front: 245/40 R17
Wheel Make & Model: Forgeline GZ3
Center: Silver Powdercoat
Rim: Polished with Clear Powdercoat
Center Cap: Custom Engraved De Tomaso Logo