Congrats on the decision and I wish you the best of luck in your search. There are a lot of M5s out there for sale and the pricing is pretty fair for the most part.
I would recommend doing research on the web because you can find tons on information out there from other owners. Also, when you go to drive the car insist on a long spirited test drive. I spent around 40 minutes on my test drives and made sure to test the car at high speeds (around 140MPH) and on back country roads. I wanted to make sure the brakes were warmed up and so was everything else. When shopping for this type of car the sale person should understand these requests.
Another thing I highly recommend is purchasing some sort of extended warranty coverage. This should be a dealer warranty or by purchasing a CPO M5. I do not recommend 3rd party warranties because I have had issues with them in the past.
I spent the last year looking and driving M5s and CLS55s. I finally made my decision on 10/30 of this year to pick mine up
Take your time and good luck!
2006 BMW M5: 19x9 & 19x11 Forgestar F14s with 265/35s & 305/30s, Rouge Engineering Diablo Exhaust, RPI Pulley, and H&R Springs
2003 BMW M3 Vert: CSL 19" Reps, HSD Coilovers, Dynavin D99, more to come
*SOLD*1999 BMW M3 Convertible (Dinan S3)
*SOLD*2001.5 Audi S4
*SOLD*2002 VW Jetta Wagon 1.8T
*SOLD*2001 Porsche Carrera 4
*SOLD*1996 BMW M3
Last edited by TMACM5; 11-10-2010 at 06:38 AM.