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I agree with Dannat's explanation, which also agrees with your coffee calcs.
Another option would be for you to go for:
Nagler 13mm: 77x for medium power cluster views (barlow to 144x for small objects)
Nagler 5mm: 200x for routine planetary/lunar, double star splitting (barlow if/when seeing allows)
Barlows are a great money saver (and handy for astrophotography), but some find them a hassle to be wielding them all the time for common/routine viewing.
Also, keep in mind that although Naglers are great, you need to "look around" in the eyepiece to see more than about 68 degrees at once. For this reason (and value), some Televue buyers tend to get Panoptics for lower power EPs.
Cheers,
Jeff
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