I am a 51 year old male, who had a CABG X6 (6 bypasses) two and a half years ago. My cardiologist and an arrythmia specialist are advising me that I need to have a pacemaker implanted b/c of a defective SA node. I am 6', 180 lbs, have never been overweight, don't drink or smoke, like to run, hit a boxing heavybag, and work out with weights. Which pacemakers should I consider?