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Hi Aaron,
A 100mm f/5 achro is a ripper of an option for a second scope!
For some time I had wanted to get my hands on a really wide field scope as I have several Newts, and they all have tight fields of view (relatively). But I wanted to go really wide as my 11X70 binos revealed a totally different sky than the one I was used to.
Going really wide and rich-field is the only way to see the mottled background glow that surrounds Omega Centauri, the twisted mess of dark lanes that cut through and around M7, and the extraordinary view that is M8 and M20 and their expansive surrounds, all in the one field of view.
I tried an 80mm f/5 achro, and even though it could give me upto a 6° TFOV, I felt there still was a small lack in aperture 'lift'. So I've settled on a 100mm f/5 achro. With a 30mm 82° eyepiece it gives me a 5° TFOV, and a wonderful image punch that the larger aperture can only give.
If imaging is not a foreseeable possibility, then I can recommend a 100mm f/5 achro as a very good second scope.
Mental.
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