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I would try and get a combi drill with hammer and impact driver bundle. I prefer to have two batteries, one big battery will last a decent amount of time, but sods law it will always be flat just when you need it. With two batteries you can always have one fully charged. Also if you are drilling and screwing at same time, it is much easier having two batteries to do so.
What brand will come down to budget. I would get 18v though, lower voltage stuff is great if you want lightweight, but reckon you are man enough to hold the weight ;-)
I would just go to screwfix and get the best reviewed one for your budget.
If you are on a really tight budget then Erbauer stuff is better than it should be for the price.
If not there isn't a huge difference between Hitachi, DeWalt and Makita at the lower end of the budget, with a bit of shopping around, you should be able to get a twin pack for sub £200, just check the size of the batteries, as quite often they will save money by putting in cheaper batteries, I have two 4ah batteries, and find that covers most stuff.
Last point... Choose wisely, as if you pick a brand you like, you can then buy bare units in the future without having to buy extra batteries.
Whats a good cordless drill to own?
Something with power and perhaps battery packs that can be used on other power tools?
Bosch? Ryobi? Black and Decker?