980 Grade 1 Deadbolt
I am not sure of the pricing but I doubt it is anywhere 350 dollars. I have dabbled in locksmithing and just today "bumped" a schlage 5 pin in 2 hits (about 10 seconds) and the first hit was my fault. The six pins are a sturdier lock and also use a less generic key blank. None of this will keep out a seasoned picker but it will keep out the smart guys watching you tube. The door brace is a good thought. As to strengthening the jamb plates will go a ways against a brute force attack.
Lock Reinforcement Hardware - Door Locks & Deadbolts - Ace Hardware