Buy it for 100K now and you would be lucky if someone gives you $60K in a year regardless if you keep the miles low.
I still don't understand why anyone would buy a 2013 M3 where the new one is just around the corner. (yeah i got the whole last V8 & etc thing)
On the other hand there is a nice E92 Dakar on Ebay that is much nicer than what Portland has.....also much cheaper.
Current: 2016 F10 535i xDrive AW w/ Black Dakota, ZMM, ZCW, ZDA, ZDB, ZPP, 688 & Black Grills.
Retired: 2011 E92 M3 -AW
....ED April 29th, 2010
Retired: 2007 E92 335i -Space Gray.....ED Oct 19th, 2006