Reddit reviews A Field Guide to Western Butterflies (Peterson Field Guide)
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I'd also suggest ditching the Audubon guide. Quite frankly, it's rubbish. Poorly organized, and a number of the photos are incorrectly ID'd. I highly recommend the Kauffman Guide to Insects by Eric Eaton for a broad overview of North American insect fauna.
Otherwise, if you're focusing on butterflies, the Peterson guides are quite useful. The eastern and western volumes by Opler are both useful, but lack quality keys.
The recently revised Peterson guide to Northeastern moths by Beadle & Leckie is impressive in its coverage (but by no means comprehensive) but similarly lacks any sort of useful key for identification.
If you're looking for other field guide recommendations, I'd be happy to share!
In terms of field guides, I've found both Glassberg's "Butterflies through Binoculars" and Petersen's "Field Guide to Western Butterflies" to be amazingly helpful for identifying Leps on the go.
Technical books can be a bit trickier, however. I wholeheartedly agree with sandozguineapig's recommendation on Triplehorn's textbook. I'm currently using the 7th edition for many of my entomology courses and both the keys and family descriptions are excellent for all the insect orders. Another book my Lepidopterist friend actually uses in her work is Scoble's "The Lepidoptera: Form, Function and Diversity" and tells me it is also quite an excellent book.
I'll be sure to ask some folks around lab to see if they have any suggestions!