For me, 10x works to 500 yards if I have a good, clear target and a steady rest (Think KD range on painted swingers) 600 would be my absolute limit with 10x on a live target and the day would have to be perfect. First and last light, no way.. I'd have to be closer. Even at 3x it would be too dark for me.
On steel and paper, 10x is fine to 1k depending on the target size and reticle thickness. You'll probably fine yourself wanting a little more magnification target shooting in a static range.
Tough choice. The 2.5-10 compacts are awesome scopes. I have a couple and love them. Depending on how much time I was going to be handling the rifle (stalking in after lunch, etc) or in a tree stand would guide my choice. 7 oz slung is almost nothing and in the hand it could be overcome with light weight rings, a carbon or less dense wooden stock, aluminum floorplate, blind mag, etc.