It all depends on how often you are going to use them. If you are going to drill say 3x-10x a year, why bother to pay for something so expensive. Power and price and whether it is chuck or chuckless play very little part to it. The most important thing to ask is how long before the drill will become a permanent resident in the store room?
I like to share some of the pointers dicuss in this thread
a. the chuck and chuckless thingy are just gimmick. How often do you change drill bit on the fly?
b. Dont be too over excited about the drill bit supplied in the packaging. They are not as good as those with tungsten carbide tip?
c. Drill vs hammer? Hammer is like "punching", good for concrete. But remember, hammer also worn the drill bit as well. So make sure get a good one.
OK, now for the brands
Black and Decker are the consumer brand. Good enough for normal household use. Cheap and good. If you want the professional version, then get DeWalt. Both are made in China. Except DeWalt is more expensive.
Makita is another long and reliable brand. Have been around for ages. Green one for consumer use, blue one for industrial use.
Hitachi - also another reliable brand.
I prefer Panasonic, but cannot get it here in Singapore. Very popular in the US.
As for places to get them, I suggest Rochor Centre. There is a hardware shop which is just above the car park entry of the underground car park. Next to the CD shop. Very popular among the main contractors. You can also get excellent drill bits for them.