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For your first pair I'd recommend low power binos for hand held use. 7x50, 8x40, 10x50. No more than 10x. For a second pair, a 15x70 or 20x80 would be nice though.
Don't buy binos to observe planets. That's telescope (or VERY expensive bino) territory. Most binos are not well suited to that task - being effectively a pair of short tube achromats.
You need to be aware of the difficulties of observing with a large pair of tripod mounted binos - whether 15x70 or 20x80. On an ordinary camera tripod style mount you will be limited to a max of about 40 degrees above the horizon. It gets very uncomfortable to look up any higher than that, and next to impossible to observe anything close to zenith. You can however lie on your back on a blanket or recliner and use the binos hand held, in which case I'd say go for the 15x70 over the 20x80.
There are more specialised bino mounts you can get or make that will allow you to observe the entire sky in comfort. These will cost a fair bit more than the binos themselves. Try Frontier Optics - they sell Universal Astronomics products who make what appear to be good bino mounts for astronomy.
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