I'd go for the cheap offer of the PS2 and buy Gran Tourismo 4. It's great fun and includes quite some Le Mans greats. Do yourselfe the favour of adding the steeringwheel set to,for it'll add a big dose of realism to the game.
(the icing on the cake though,is the inclusion of the Nordschleife. Still THE most accurate replica of this great track)
However,for real hardcore simulation you should deffinetly go for a Logitech steeringwheel set up and drive simulators like rFactor and GTR2.
The good thing is that you can keep adding new tracks and cars to your collection. At the moment work is underway for the entire startinggrid of LM 2006 and also the latest Peugeot is nearing completion!
http://team.motorsport.phpnet.org/mo...od_lemans_2006
http://team.motorsport.phpnet.org/mo...4f0d4b2991f5cb