A good power drill is one that will drill the holes you want to drill. If you want to have a good cordless drill that will drill holes on most household applications, a good choice might be a name brand 14.4 volt cordless drill or a name brand plug-in drill may be suitable at a slightly lower price.
Keep in mind that most cordless drills have a built in clutch to prevent stripping screws and most plug in drills do not. Also, be sure that you buy one with at least a variable speed motor and a reverse switch. A Keyless chuck is also a really nice feature.
As a carpenter, I have been using my 9.6 volt makita cordless drill since I bought it in 1987 and I rarely ever reach for anything else when I need a power screwdriver. But I also own an 18 volt Dewalt drill that cost twice as much as the makita, and if I must drill holes I use it instead because it is more powerful and the battery lasts much longer.
My smallest plug-in drill is a Makita hammer drill. I hardly ever use this drill as a hammer drill, only as a regular drill when I need more power than my cordless drills offer me. When I need a hammer drill, I usually use my Bosch bulldog SDS-plus drill because it just works better.
My point then is simple, reflect on what you might be using the drill for after you buy it, and then buy the one that best fits the bill.