Hi,
By way of example I have a T41 laptop, it has a titanium case and has been solid as a rock; being outside in the dew it probably will outlast my Toshiba lappie which stays at home all day.
The 40D is heavier than the 450D which may be a consideration but the build quality is far superior and includes a degree of weatherproofing which the 450D doesnt have. It is also far more rugged.
If there is only a 100 buck choice between the two I would go the 40D, for this reason alone and maybe also for future possible resale value.
Paul
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