id go with the caddy; nuless you're living in the arctic north, and you dont have a "daily driver"
if i had a CTS-6, i wouldnt need cafeen in the morning. its faster then an S4 too.. . but performance doesnt matter. i know i wish i had the $$ to have an option set like that lol. well im on that subject, id go with a 2002 T/A WS6, and build up that 5.7 block with the remaining money. nut thats just my opinion