I've had good experiences with the Sig Kilo line. Started with a 2000 and was immediately impressed with the speed and accuracy compared to my Zeiss and Bushnell units.
I recently picked up a 2400ABS during the Midway $1100 dollar deal and I'm simply amazed with it's performance.
First-round hits on targets at 700, 770, 830 and 890 yards with 1200' altitude change. I managed to easily range a steel plate at a mile in rolling forest and scare the hell out of it, but no hits... Wind was all over the place and I'm not that good- yet! My Bushnell rangefinding binos wouldn't even give me a return at that distance.