What do you want to use them for??? If scenery- you can have more of a range. If watching marine wildlife you need wide angle and my recommendation is 10x50's. There are a lot of options- most important is to try them out and make sure the pair operate right for your needs. More magnification is necessary if wildlife is a priority. I have taken 2 pair in the past- got real good at switching and keeping track. Not for most people though.
I like to hunt a lot and have two pairs of very good binocs. Anyway, if you have the dough, get some Zeiss or Swarovski's. If not so much dough, get some Wind River's. Very good and will cost you about 200-300. I have a pair of Swarovski pocket binocs and they wonderful. I would get 7 - 10 power. Anymore than that will be difficult to hold still. Also, get 30-50 mm for low light gathering.
Going on our 10th trip to Alaska this summer - our first cruise. And taking a pair of Nikon "Action EX" binoculars. They are 10x50 and waterproof which is great for Alaska. They are about $180.00 at a Cabela's or Galyon's. Have fun!