Cutting into a case with a plastic or thin steel side panel with a Dremel tool is fairly easy if you take your time and follow the outline of the window precisely, and the only hard part when actually installing a window is getting the darned rubber gasket to fit. It can be a tight squeeze.
But with an aluminum case, I'd myself would greatly prefer a laser cut. You are absolutely right; mutilating a nice case would be a very disappointing thing.
IMHO, unless you have a steady hand, the right tools, and have some experience with case modding, I'd order the case with the window pre-installed, or get someone with some previous experience to do it for you.
That's my opinion, for what it's worth. Ambition vs common sense ... take your pick.
Toey
<font color=red>First Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=17935" target="_new"><font color=green>Toejam31's Devastating Dalek Destroyer</font color=green></A>
<font color=red>Second Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=15942" target="_new"><font color=green>Toey's Dynamite DDR Duron</font color=green></A>
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