Hello all, I am currently on the fence between an '04 Audi A8 and an '05 STS4.I am leaning towards the STS4 though, test drove it today, man what a car! So I may become one of the ranks.

Welcome to you both!

Glad to have you as new members. Well I don't want to influence your buying but look at this site. With almost 80,000 members after 4 short years and thousands of threads we have nearly all of any Cadillac question or concern covered within these pages. You already know you want the Caddy, besides with the 05 STS you get the new body style. With the 04 Audi you don't get the new body until the 06 model. Do you want to be seen driving the "old" body style audi...I think not!
Compare for yourself!
2005 STS Review (http://www.internetautoguide.com/car-specifications/09-int/2005/cadillac/sts/index.html)
2004 A8 Review (http://www.internetautoguide.com/car-specifications/09-int/2004/audi/a8/index.html)
Good luck we hope to see pictures of your STS soon!
:welcome:
Paul