the most expensive thing i have is probably my rally cars like:
lancer evo super rally car
celica gt-four rally car
other than that i have:
ferrari scuderia (highly modified)
aston martin vanquish
mclaren mp4-12c
nsx type r '02 (highly modified)
mercedes sls
lambo murcielago lp 670-4 superveloce '09
audi r8 v10 (new)
if there something else that might interest you tell me about it and ill check my garage for it