Your body best utilizes protein in a 3-hour window anyway. Pulse feeding is how the body responds. Still, if you want to slow absorption, add in a tablespoon of fish oil or flax oil.
For daily maintenance, I like Cross-Flow Microfiltration Whey Protein Isolate -- a protein which is filtered via ceramic filters; no chemicals are used in the process so the end-result is that the protein is left unharmed and in its original state. The AA profile is very good. This leads to added benefits over ion-exchange whey isolate (which is still better than whey concentrate).
I do a custom mix of 80% CFM protein with 20% flax powder (50% fat [high Omega-3; slows absorption], 30% carbs [containing lots of fiber], 20% protein).
For post-workout, I use a 60% dextrose, 20% rice protein, 20% CFM mix. The ratio is such that it meets post-workout carb and protein requirements, is very digestible (fast-acting) and high GI (important for insulin response after a workout) and you get some nice elements from the rice protein that you don't normally see from animal-based protein. (higher glutamic acid and some other things)
Taste is good on both formulas. I order from Protein Factory.