This is what I recommend to all people, not only people who train, but the average joe blow..... You could argue this forever, and everybody is different, but this is what I would recommend....
1. Multi Vitamin -- good quality
2. Source -- Low Mercury and Heavy Metals
3. Probiotic -- Helps with digestion
4. Whey Protein -- ya'll know this
5. Greens Drink -- Gotta get your greens -- lowers PH
EDIT: Rodja is right I want to raise PH with the greens drink...