The absorption from Knight's or Ascalon armor doesn't stack, so the best would be gloves or boots from Knight's and the rest from Plate (or Gladiator's but you didn't mention that one so I won't either...kinda)
when i got my Plate form drokks,i thought it was better,but now im thinking Knights or Glad is better.Of course Platemail looks better,but Glad has more of a effect.
I wear full glads with an ascalon helm. Glads looks wicked when dyed silver, and it goes well with the ascalon help . If you're running, I'd say gladiator is a better set because of the energy bonus.