The Viper can't be traded due to the 1 million limit unfortunately, any other cars you can offer? Looking for standard JGTC and rally cars in particular.
Are you sure? I purchased it for $999,230.
I have a Castrol Mugen NSX, a Nomad Diablo, but could probably get my hands on other ones. As for rally cars I have a Citroen C4 WRC, and that's about it.
Other interesting cars off the top of my head:
GT-R LM Roadgoing Version
Lotus Carlton
Ruf Yellow Bird (now painted black)
Ruf BTR
Ruf CTR2 (painted AMG grau magno)
TVR T350C
Option Z
Ferrari 458 Italia
Spyker Laviolette
HKS Silvia
Aston Martin Vanquish
Jaguar XJ220
NISMO 270R
Ferrari F430 Scuderia
Lamborghini Murcielago LP640 in matte coffee brown
NISMO R32 Skyline S-Tune
Opera S2000
Saleen S7
McLaren MP4-12C
Lamborghini Gallardo in matte lime green
Opera 350Z
Amuse S2000 R1
Amuse S2000 GT1 Turbo in matte red
Subaru Impreza 22B
Ferrari 599
Subaru Impreza STi Spec C
Mine's R34 Skyline GT-R '00 (this is the standard version NOT available in dealerships--the dealer has the '06 model)