Look, no offense but it's a stupid question that you guy have been answering. It's clear the original poster isn't the slightest bit knowledgeable about his question. I'd be embarrassed about asking about "killer accuracy and focus up to 1000 yds". This thread isn't worth posting about.
There are lots of good scopes. Leupold, Schmidt Bender, Nightforce, US Optics, Swarovski, etc etc.
Depends on your budget and your needs. Most people find that a Leupold Mark 4 tactical is about the entry level for a "really good" long range scope. Look to spend over a grand. Prices for Schmidt Bender, US Optics, etc go way up from there.
Keep in mind, a good scope does not create accuracy. It only helps you the shooter to use whatever accuracy your rifle is already capable of. With a standard M1A and good ammo, you are probably looking at about 2-3 MOA accuracy potential, and even a $3000 scope is not going to make that better. It will just help you get that 2-3 MOA more consistently.
If you want better accuracy than that, you will need to do some accurizing/tuning to the rifle and get the best possible ammo, then the scope will again help you use the "new and improved" accuracy potential of the rifle/ammo combo.