Hi Will
Anything less that 50mm objectives will leave you wishing for more light-grabbing power when you go looking for fainter galaxies and nebulae. My "workhorse" pair are 12x60 - usually on a tripod. Magnification is a tough call. 8x to 10x is easier to locate objects, but you'll often wish you had more. The Moon is initially WOW!, but then you'd love to get a bit closer to those mountains and craters. As I said, I use 12x - I wouldn't suggest less that 10x. 15x is on the edge of being quite difficult to locate your target.
I've never had IS, but I understand that you may want plenty of spare batteries in your back pocket?
Good luck. Others will have direct experience to share, I'm sure.
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