Disclaimer: I am seller of high end optics, so I am biased.
Rather than dwelling on brands, I'll try to provide you with a little info to help you decide what configuration will best suit your needs.
Straight vs. Angled Eyepiece:
If you will be doing most of your shooting from the prone position, then a straight is much preferred over an angled. Likewise, if you will be glued to a bench, a straight will be easier to use - provided you can situate the scope beside you on the bench. If, however, you will be viewing while standing or kneeling, then an angled is easier to adjust and easier on your neck.
Objective Size:
If you do not plan on packing the scope around, then a larger objective is preferred. Without getting too technical, a larger objective will gather more light which will provide you with a brighter image throughout the day, and throughout the magnification range.
Magnification Range:
While more magnification may seem the way to go, visual quality must be considered. With a cheaper scope exhibiting a smaller objective, the quality of the image at the higher end of the magnification range may not be satisfactory (the exit pupil decreases as the magnification gets higher resulting in a darker image). Likewise, if you are shooting beyond 300 yards, a "lower quality" scope may not provide you with the visual accuity that you require to see where you are hitting with ease.
Tripod:
Quite simply, buy the best that you can afford. Many people spend all of their money on their scope and leave little for the tripod. However what is the point of having a great scope if the tripod is wobbly and unstable - the resulting image will be difficult to view for any appreciable time. The tripod is a critical component of the viewing system.
Hopefully that info provides you with some utility.
