Tactical Scopes
I have an IOR 6x42 w/ MP8 reticle on my Savage, an IOR 2.5-10x42 on a sporterized Turk, and a Bushnell Elite 3200 10x40 on another heavy barreled 308.
The fixed 6x scope is plenty for serious "tactical" work, as is the fixed 10x Bushnell. The 2.5-10x Variable does just as well as the other two, I leave it set at 10x for all intents and purposes.
The Bushnell is a surprising buy, available for under 200 bucks and with a great warrantee. The Elite models are made by Light Optical Works of Japan and are a good alternative to the SuperSniper offerings that are made by Hakko (also in Japan) which is also a great buy.
IOR Glass is made by Schott, which is Zeiss' supplier as well. Best glass for the money, on par with USO or Nightforce, the 6x42 model can be had for under 500, but if you want anything in the 10x range your best bet is to look for a used scope.
In your budget your best bet for a fixed scope is either a Bushnell or SuperSniper, and for a variable with mildot reticle is a Bushnell or Nikon.
This should meet all of your needs if you want more magnification than 10x;
http://www.riflescopes.com/products/426242P/bushnell_6-24x40_elite_4200_rifle_scope.htm Altho the Nikon Monarch is better for "tactical" purposes since the Elite has 1/8th MOA adjustments which is a fine for a target or varminting scope, but a little annoying for rapid adjustment between ranges.
You will also want to look into a 20 MOA base so that you can free up some adjustment for reaching out to 1K, if you get the itch.
Jimro