I think mine is worth around mid 20's. (At least I hope, it's kind of depressing how much our M5's have depreciated the last year) I have an 02 with 70k on the clock and BB Tri Flo exhaust.
Current: 1989 325i Conv
-2008 328i Jet Black on Black, Premium, Sport, Nav, Step, Paddle, Ipod
-2002 M5 LeMans Blue on Black. Rear Sunshade, M-Sound, Heated Seats, Xenon, PDC
-2004 M3 Convertible. Silver Grey on Grey. SMG, Nav, HK Sound, Heated Seats, Xenon
-2007 335i Jet Black, Terra Leather, Premium, Sport, Step, Paddle, Nav, Comfort Access
-2006 525i Black Sapphire Metallic with Beige, Manual, Nav, HUD, PDC, Xenon
-2002 325i Orient Blue Metallic, Beige interior, Manual, Sunroof