big tom, here are a few things to concider before you purchase.
as has been mentioned before specific use is going to determine the "best" scope for you.
Most hunting and general have fun shooting will likely be best with a variable power in the range of 3-9x40 to 4-12x40 (again allready mentioned). Any higher than 12 power will cause you to see nothing but mirage waves in warm temperatures. These can severely effect your accuracy. You can also choose between many different reticles (fine cross hairs, mill dot, post, bullet drop compensator, duplex, target dot) and many more. Check out the Burris optics, Alpen optics, Vortex optics, and Nikon websites. They have several reticles with detailed explanations and pictures.
The higher the magnification power the smaller your field of view will be. The less expensive scopes may not be clear and sharp at long ranges.
The target models are mostly designed to be able to adjust your scope to the desired range at the time you will be shooting. You will need to understand the tragectory or your rifle to use them to their full potential. So get some local training if it is available. You can google search small arms ballistics and read up on the subject. also visit the hornady ammunition website and use the ballistics calculator to see the tragectory of your rifle. You will have to enter the ballistic coeffcient of your bullet ( it is different from one manufacturer to another but you can find a close match in hornady's handloading bullet selection at the website, it is listed in the description of the bullet). This will give you a good idea of what the majority of your bullets will do at various ranges.
Hope this helps more than it hinders. Ask if anything is not making sense.
Buy as much scope as you can afford, you will be much happier!