there are a bunch of options out there, and as mentioned above mueller is a great scope at a great price.
if price isn't an issue, the choices seem endless. if on a budget there are still many options available. for a scope that offers pretty good clarity, magnification, turrets, and other usable features the centerpoint 4-16x adventure class scope (sold at walmart for around $69.00) is a great buy.
besides price, another thing to consider is the reticle. for a dedicated target rifle, i like the finest crosshairs and target dot in the center. but for "educating" myself when it comes to rangefinding, any holdover, etc. i prefer the mildot reticle.
probably the biggest factor is clarity, you like to see what you are shooting at. 3-9x are ok, but for targets ranging from 50 to 200 yards, i prefer 4-16, 6-18x or 6-24x variable scopes as they are more "flexible" for all those different ranges, different sized targets, and easier to spot your hits.
one thing that i have found through the years (and i am cheap) is to buy a good clear, reputable, dependable optic up front. there are many for around $300.00 or under (including millet, burris, super sniper, vortex, mueller, nikon buckmaster series, and others) that offer great glass and options that will last. i've learned it's better to cry once in the beginning, than to cry twice later.
definately do your homework, compare options, price, reticles, etc. and see how it will fit your style of shooting and budget.
asking the topic "what scope" is tough as many suggestions will be based on personal preference than actual facts, so make sure you weigh the pros and cons of the scopes that'll fit your needs, narrow your choices down to 2 or 3, then pick the one that has it all (or most of it all) that you need or want.
if you want to learn more about the wind, it will be to your advantage to pick up a wind meter
and run your ammo through a ballistic calculator so you can get a rough idea of what you need to do to adjust - then apply that in real conditions and note it in a data book for future reference. a data book with the ballistics of your ammo will help you out with the bullet drop stuff also.