Its like this. Few weeks back i was going to get a Honda Beat for 660,000 which was a bit hacked and it was 1992. For what i heard from everyone was that it doesnt worth 450,000. But still i wanted it as it had another value for me than a resale or real worth of it...(DevZ,Isuru,Dilan,Racersedge,Miniace are witness for how much i killed myself for it) For me it wasnt market value etc it was just HONDA BEAT.
Regarding your deal,think of your deal in this angle..
-Its almost 10years old
-Its a 300 dash car , which means the market value is nearly over interms of numbers. Becuase nowadays buyers look for the reg number as well.
-And you are going to pay 1.8 milion for that while you can get maybe a 1st owner Civic for that price with new registraion
Try the Sunday Papers this time, i saw a 2002 Integra going around the same price of yours-Just browse and see, i could be wrong on the price though.