ive found corgis tend to be typical herders, never met a truly dog agressive corgie but they do tend to be dominant and will usually try to heard other dogs, people (especially kids) heel nipping can be a problem with this breed especially with kids/otherdogs. however if trained right and given a job to do there wonderfull dogs and even with those little legs tend to be high energy and good agility dogs!
the poodle coat does require a good brush/comb out, and then depending on the coat difficulty increases form there...
of course the fancier the cut the more work, a natural coated poodle from what im told is very little work in the grand scheme (you also dont have to worry about shedding) i was/still am looking into a standard poodle (its either a standard or a dane, i REALY want a dane but i do love the standards too)
poodles tend to be the most eager to do "tricks" to please, there VERY smart and not usually quite as stubborn in the learning part as some of the other toys. Paps are origioanlly terriers, but seem more eager and less stubborn than most, the pap would have the same kind of energy as the shelties/bordercollies. not quite as fast as a boarder but that same kind of high energy drive...of the TOY breeds paps are probbaly the most intense.