Percherons are the greatest. I've had mine for 9 years. And actually they are not more expensive to feed. It's a misconception that because they are bigger they eat more and that just isn't the case.
My boy eats the same amount asmost of the other horses where I board - which is 2-3 flakes in the a.m. And 2-3 flakes in the evening. NO grain. There is a draft specific diet that involves high fat that my boy is on. He also gets a cup of corn oil and two scoops of MSM for his hooves.
The things that are more expensive is farrier and sometimes it's REALLY hard to find a farrier that will work on drafts. My boy is 18 hands and about 2100 lbs. I keep him barefoot, he does really well.
Personally I find mine easy to handle - but that has to do with a very solid foundation of groundwork and training. He's big so he's not as collected as maybe a cross would be, but it also depends on what you really want to do with them. I have found their personalities to be just amazing. They are smart and once you earn their respect very loyal.
Once you get a draft you won't want to go to a light horse again!