I have spent the past year or so training 3-4 days a week, hitting each muscle once a week.
Now I want to train one muscle a day to allow for greater focus.
I have done a heap of reading and have incorporated some principles which I feel make sense.
Since I have never done a 5 day a week routine, can you please check it out for me.

I will be doing 2 sets @ 4-6 reps.
Once I get up to 8 reps I`ll increase the weight.
Once I can do 8-10 pullups, I`ll add another set of them.
I take 1 - 3 minute rests between sets depending on the exercise.
Workouts are 35-45 minutes.

Monday - Legs
squats
sldl
leg press
standing calf raise

Tuesday - Arms/cardio
dip machine
close-grip press
db overhead extension
ezi curls
hammer curls
cardio 10 mins

Wednesday - Shoulders/Traps
military press
db press
db lateral raise
seated db rear lateral raise
bb shruggs

Thursday - Back/cardio
pullups 1 set to exhaustion
lat pulldowns
bb rows
dl
cardio 10 mins

Friday - Chest/abs
decline db press / flat bb press (alternated weekly)
incline bb press
incline db press
weighted incline crunches 2*20
twisting crunches 2*20

N.B.
* I don`t do any dips, behind the neck presses, upright rows or scull-crushers because I had shoulder surgery a few years ago.

Weight: 190lbs
BF%: About 17%
Aim: Clean bulk to 220lbs, then cut.

Any help would be greatly appreciated since you guys know your stuff.
Later

Looks good although I'm not a fan of working out 5 days a weeks, I say don't go over 4 but if that works for you great. The only suggestions I have would be to drop cardio, you are training 5 days a week and the cardio might just be overdoing it. Also, I would swap Tuesday and Friday and also Thursday and Wednesday. Work all the major body parts at the beginning of the week. The only other thing I would change is drop the pullups unless they are really working for you, focus more on strengthening your lat pulldowns and add another rowing exercise, if you have access to a hammer strength row those things are awesome or cable rows or t-bar works well too.

Hope this helps you.

Cheers