Throw up as detailed a listing as you can muster. Post it on M5board, Bimmerforums, Autotrader, Kijiji - everywhere. I sold my E46 on E46Fanatics, which is primarily a US-based enthusiast community. Just make a note that it's a Canadian sale before the price police on US forums jumps at you.
It will sell eventually, seems to be a very nice example of an unmolested E39. They're getting tough to find.
Imola Red / Imola Red ///M5
E60 SSK, Dice iPod, GT Exhaust
BCR Coilovers, 19x10 + 19x11 Rial Daytona Race, Michelin PSS
335i M-Sport Alpine White / Coral Red
H&R Sport, CF diffuser, BMW Performance SSK
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black