Why do you want to buy binos instead of a telescope? A large, expensive pair of binoculars that have to be mounted to use properly and which cost a lot is actually an expensive low-power telescope! Nothing wrong with this, but it does defeat the purpose of using binoculars for beginner use.
The reason 10x50s are usually recommended is that:
* you can see a lot through them (because they amplify the light reaching your eyes)
* they're cheap - less than $150
* they're wide field, low magnification (meaning you can see a larger part of the night sky through them which means you can still make out constellations and get a sense of the relationship between objects in the sky)
* they're easy to use - just whip em out and pop outside.
* they can be used for other activities during the day so even if you don't stick with astronomy, you haven't blown your $150.
If you get large binos, you start knocking these things out one by one. If you end up knocking too many things out, you might as well have a telescope because you'll get more bang for your buck.
For my money I'd start with 10x50s and save up for a telescope because once you start looking at the night sky with your 10x50s and realising how many amazing things there are up there (and working out WHERE they are!) you'll be hooked and spending $600 on an 8 or 10 inch dob will be the easiest financial decision you've made in your life.
