Sibleys is my go-to guide, but I'm not sure it's the best choice if you are just beginning. For that I would still recommend Peterson's. I'm not sure if I have seen the most recent edition, but I will assume it is similar to the other editions from the past 30 years or so. Peterson tends to have more similar species illustrated together on the same page, with arrows pointing out key field marks. While some of the illustrations may appear to lack detail, they are excellent at capturing the postures and proportions. The plumages are also the variations most commonly seen in the east.
There are many good field guides available these days. I haven't looked at most of them. The only one I wouldn't recommend is the ROM guide. It has some blatant errors, and is an embarrassment to the ROM.
For apps (in Android at least), I have Audubon, iBird, and Sibleys. I find Sibleys by far the most useful. It's a lot more expensive than the others, but worth it. The Audubon app goes on sale regularly. All of the apps have a good library of bird songs and calls.
BB
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