Assuming you have a cordless drill - if you stick to the same brand/battery so you can swap batteries between the tools, you'll have done yourself a favor.
Otherwise - hard to go wrong with any of the big names on a tool like this that you're not going to use too intensively.
Milwaukee, Dewalt, Makita, Bosch -
I'd say just go to a store that has some on display and see which one feels right to you. They'll all perform pretty much equally well.