Going to pull the trigger on a spotter. Is there any sense in getting one that has the same magnification (high end) as your binos or have you just duplicated the same piece of equipment?

Also, is there a huge difference between 50-60-80mm etc objectives? Upside? Downside?

Im from the school that bigger isn't always better. I need a good spotter to compliment my binos (10x42) but don't need the next Hubble.

Also looking to pack this baby around and use with my tripod.

Appreciate the help/suggestions.