This thread is almost 3 months old and this topic has been hashed a few times, but I feel my set-up is near ideal for an open country hunter. I have 8x30SLC, 15x SLC, and 65mm Swaro HD spotter. I might go for the 8.5x42 EL's in replacement of my small SLC's, but I only paid $750 for them brand new at Sportsman's last year and the weight on them is excellent.
Their purpose is:
8x30 - Small, Light, excellent glass kept on my neck at all times and good for seeing deer up to a mile and elk a bit further. Despite their light weight I will always put them on a rest of some sort given the opportunity as any bino works better supported.
15x - Nothing find game better than big eye bino's. I find mine are the perfect balance between clarity, magnification, and ease of use and can only find their potential on a tripod. They can be used without a tripod, but their effective range is cut in half.
20-60x 65mm HD Spotter - Used 80% to judge game after finding them with the bino's, mostly 15x's. The biggest downside to glassing for game w/ spotter is that the atmospheric conditions from wind and heat waves maves anything at 30x or higher very unclear. Again a very sturdy tripod can help, but heatwaves and haze still takes away too much too often.
In the end the 8x's are probably where anyone should start, but here in Idaho my 15's account for finding way more game than the others and that's where it all starts, finding the game. If I was stating out and had a limited budget, as much as I love the 15's I would probably go with the 8's, then spotter, then 15's last as you can cover the gambit without them but believe me your game counts will double once you complete the trifecta.
Good luck.