I only one to buy one drill, which one?

I need to some small DIY, I have a basic black and decker drill which can go through a wood, but not concrete and brick walls. I need to install some fans and lights points as well as water heater. Bit tad confuse as there are impact drill and hammer drill. Which one should I get?

Update: I got the makita corded hammer drill. Going to get an impact driver as well

Update no2: I managed to get some clients, got myself a Milwauke set of tools.