If you are a contractor, by all means buy a contractor grade drill. If you are a homeowner, buying a drill made to be used 10 hours a day for years is overbuying, IMHO. I have a Ryobi with 10+ years on it. A year or so ago, upgraded to the new NiMH batteries and a smart charger. NiCADs were 5 years old and still working, but the new tech has double the capacity. They also hold a charge, basically forever.
I also have several other tools that use the same batteries, which is nice. After several years the motor in my circular saw burned out. I thought I would have to buy a new saw. Nope - new motor was less than $20.00 shipped. Saw is back in service.
All in all, I am happy with Ryobi tools, for my purposes.