...If it was for home use I would look at the ryobi range at bunnings, buy a drill pack with the batteries and charger and then you can add extra tools as you need them...
x3.
I've got one of the new Ryobi 18v Li drills, and it's a magic bit of kit. I love that you can swap the batteries between tools if you buy into the system, and I love that the wall mounted charger keeps the second battery charged up. It's always ready to go, and has never struggled with anything yet.
That said, it's only new still, so will have to wait and see how it lasts. I swore off battery drills for the better part of 10 years, but am now converted to them again.
I'd suggest that these days, so long as you buy into a decent brand, you'll get a good piece of equipment. The biggest thing to me would be to look at what the battery system includes - no point investing heavily in Brand X's batteries and tools, only to the realise that you really need Tool Y, and that brand don't have it as part of their system.
Good luck!
Matto