i have experimented with most training programs out there. with the heavy weight, low rep approaches, i have expericed a good deal of strength increase in the lower rep ranges and although strength is important, lower reps never have given me the mass that working at the higher rep range has. we are all different though and respond differently to a specific style of training. for me, i tend to get more injuries when i focus on low reps. i've concluded that my joints just aren't meant to take that kind of a beating. i have found that working in the 12-20 range works well for me. if i were using, lets say the 100 lb DBs for 4 sets of 8 reps on an exercise, instead of moving to the 110's, i will focus on conditioning my body to use the 100's for 20 reps. of course, it will take time to make that jump from 8 reps to 20 reps, but over time, just like in any program, i can increase. and in the process, i grow much better. i work each body part one to two times a wk, depending on the body part. each session last about 1.5 hours and i do anything from 18-30 sets per body part. i didnt start out that way. i started with 16 sets on every body part. over time, i've added more and learned how my body responds. 

it cant hurt to give these programs a try and see how you do. the only way you'll be able to figure out what works best for you, is to experiment and over time, you'll find out what you best respond to. word of adivce, i think the number one downfall that people have when doing a new training program is not giving it enough time. make sure you stick with it for a few months and give the idea a fair shake.