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RE: Bamboozled by bandwidth

Just getting going here and have read all the QEX articles with great interest. I am bewitched, bothered and bewildered over the question of bandwidth requirements.
It would be useful to see a display of activity taking place in the frequency spectrum of interest for example my operation is almost exclusively in the low 25 kHz of the HF CW bands. When in QSO I only need a 100 Hz or so and I note that Leif states that large bandwidths are primarily required for noise reduction functions but that increases the problems of dealing with large in-band signals.

Given a high performance HF radio (mine is a Ten-tec Omni pro) with 100 Hz Xtal filtering, linrad DSP and a 16 bit sound card what's to be gained by more elaborate hardware measures that increase bandwidth ? What am I missing ?