I like the idea of working the muscles thoroughly once per week. How about doing a high rep/low rep workout per muscle group. For example:
Legs
Squats - 16 Reps
Leg Press - 10 Reps
Lunges - 16 Reps
Deadlifts - 10 Reps
Chest
Pushups - 16 Reps
Chest Fly - 10 Reps
Chest Press - 16 Reps
Pullovers - 10 Reps
Legs
Squats - 16 Reps
Leg Press - 10 Reps
Lunges - 16 Reps
Deadlifts - 10 Reps
Chest
Pushups - 16 Reps
Chest Fly - 10 Reps
Chest Press - 16 Reps
Pullovers - 10 Reps