How to choose best scope?

Hello guys,
I am new here, but have read this forum for long time.
Few months ago I have purchased rifle. Rifle is using 7,62x53R cartridges.
After few shoots rifle scope was broken - now looking for best solution, but the budget is $400.
I know that is very small budget and it will be hard to get good scope.
The question is next - what scope to purchase for this money? With fixed magnification or with variable? I want to shoot up to 600 yards.
Thanks guys!
Good shooting for you all!
P.S. My first choose was Millett 6-25x56, but need more opinions. Also I am opened for offers.

That exact the model of your new rifle? It is hard to give the proper suggestion without knowledge of the type and setup of your gun.

Hey, in my opinion, you need to buy a new Vortex Optics Strike Eagle 1-6x24 Second Focal Plane Riflescope. This is a good scope with the different features. You can find the full review of this scope on the ballachy.com site. Also, this scope cost completely fits your budget, and I have a bonus coupon that will expire soon at my local weapon magazine. If they deliver the scope to your location, I can help you with delivery and cut the additional 50$ from its price.