I'm wanting to install a window in my case. Is it better to use a nibbling tool or a Dremel? I want a clean cut and heard the nibbling tool would be better, but I already have a Dremel.

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'ZX

Shuttle AK-31A (rev 3.1)
XP 1600+ (OCed to 1544 MHz)
OCZ PC-2400, 256MB@CAS 2
Gainward GeForce3 Ti-200 (225/530)
WDC 100 GB, 7200RPM
Sony Trinitron 19"