It's reasonable if other people are paying it. Comparing it to 2004 3 series doesn't really mean much.
Check edmunds.com, kbb.com, etc. to find out what others are paying.
2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition