I switch mine up a good bit. Usually it goes like this
Monday & Thurs=Back, Shoulders & Bi's
Tuesday & Friday= Chest & Tri's
Wed is legs once in a while, I never work legs but need to.
After about a month I switch to Chest/Bi's and Back/Tri's, do that for a month then go back to Back/Bi's and Chest/Tri's.
I go heavy, and no more than 10 reps for a warmup, and 8 for first set. Usually I'll pyramid the weight going up as the reps come down, with my sets being 8,6, and try for 5 on last one. However, being 180lbs with small bone structure has caused me problems with my joints in my wrists/elbows. I guess the EZ bar curls with 160lbs on it was too much. I now try to do less weight and concentrate on the muscles themselves instead of the weight. Staying hurt sucks.