Tri Tronics is the best. I think you should get the 1 mile range and make sure you are always in distance of them.
I don't think shocking them will help much in this situation though. When you have dogs that will not come to you, especially when you are within ear shot of even sight, you need to go back to good old obedience training and reinforce who is running the show. Shock collars are best used when the dog doesn't know where the shock is coming from. If you get pissed and just hammer them, they will be even more skiddish of you.