I would say SCHMIDT & BENDER. look at thier PM series 3x12 Its on the heavy side, but what a scope. Or their 3X12X42 Percsion hunter model with p 3 reticle. I dont know what kind of distance you'll get out of it. They are built like tanks.
I defenatly would not spend a lot of money on a scope the was a second focal plane scope. I perfer the first focal plane because your accuracy is the same at any magnification from what I understand. The old Swarovski are nice to, but for some stupid reason they stopped making them.
Having a Swarovski and a Schmidt. I find Optics between the 2 a little clearer and brighter on the Schmidt. Bright by saying I am able to make out objects and their outlines better. Alot of people from what I understand the handful of high end scopes are coated to let certin types of light in for this.
I have the S&B on my 30-378 weatherby with a picatinny rail, It less than 11lbs right around the 10 mark