Hmm... I might in a few weeks. I'm due for an annual upgrade. I currently have a Droid Incredible. It may not be a huge upgrade, but specs look better.
Hmm... its cone area vs motor force. Its a tough one.
Are you sure either setup will fit in the trunk? I understand that the trunk is big, but still.. Have you played with Torres?
The 18s should like a smaller box. Jacob posted that the 18s like 4-5 cubes each.
Edit: http://www.soundsolutionsaudio.com/forum/topic/44977-enclosure-sizes-for-all-the-series-of-woofers/