That's firmly 130i territory, I can't see a 170k 123d fetching that even if it's mint.
Now, in fairness I did just look at TM and see most are in or above your quoted range, damn, there's even someone trying to hawk one for $20k which is idiotic.
I simply can't see how one could be worth more than $5k, it's a 14 year old car but the used car market is insane at the moment so I suppose if you're patient then aim high and see how you go.
Regardless of my ramblings, GLWS OP.