Hi Sumo2000,
The object of splitting your routine is to get your workout back down to approximately 24 sets (across all exercises) and 45 minutes. After 24/:45, your energy and testosterone levels go way down.
The ideal routine is to do the whole body in one workout and then let the body recover. Much of the strength and energy depletion that occurs is not area specific.
However, as people progress with their training, they find they cannot keep their sets below 24 or time below 45 minutes so they compromise by splitting their routine.
Once you plateau with a whole body workout, the first split you can try is a simple upper body / lower body split. For example, Upper on Mondays and Thursdays and Lower on Tuesdays and Fridays. Hopefully, this gets your sets and time back below the 24/:45 ceiling.
After you plateau with the 2-way split, you can try a 3-way split. Legs (Quads, Hams, Lower Back, and Calves), Pull (lats, traps, bi's, and rear delts), and Push (chest, tri's, front & side delts, and forearms).
Below is a 3-week cycle with 5 workout days per week. Since 3 does not divide into 5 evenly, there will be one area that you only work once per week. The others will be worked twice per week. That once-per-week area (Wednesday) should be the extra heavy day where you put in any intensity tricks like descending sets or forced reps. The days not listed are rest days.
Week 1:
Mon: Legs
Tue: Pull
Wed: Push
Fri: Legs
Sat: Pull
Week 2:
Mon: Push
Tue: Legs
Wed: Pull
Fri: Push
Sat: Legs
Week 3:
Mon: Pull
Tue: Push
Wed: Legs
Fri: Pull
Sat: Push
Week 4 is the same as week 1.
Once you plateau with that, then the 5-day splits that are mentioned above are a good bet.
Be wary using splits to heap the amount of work onto your routine. Once you raise the intensity level there is really little way to go back down and still achieve results. Do just enough to get results. People who start with the "muscleheadmag" routine of 6 sets per exercise exhaust themselves and cannot really return to a 2-3 sets per bodypart without lowering their intensity and jeopardizing results.
In the split routine you mentioned, I would move back and shoulders ahead of bi's and abs. Most lat work also involves the biceps and the biceps can quickly become the limiting factor (so your lats never get stressed).
I would do deadlifts on your legs day. It's better to trash them with everything on one day and let them rest than to do some leg work every day.
HTH,
James