Now that the OP bought a 450EXC, no need to talk anymore about the 450X, right? Besides, the 450EXC IS a better bike, here's an 06' I just picked up with only 1100 miles/64.3 hours and current green sticker. The California DMV gave me the ok to make it street legal and issue a plate.
here it is the day I picked it up, with a brand new Rear tire
only 64.3/1114 miles...
the BD kit installed
California plated low time/miles 450EXC for under $3200